Browse Other O Word Lengths
8-Letter O Words by Ending Letter
All 1,742 8-Letter Words Starting With O
oafishlyin an oafish manneroakinessThe property of being oakyoaktreesplural of oaktreeoakwoodsplural of oakwoodoarbladeAlternative form of oar blade.oatbreadbread made with oatmealoatcakesplural of oatcakeoatflakeA flake made from oat.oatgrassAny of various grasses resembling oats:oathableCapable of having an oath administered to one: fit to be sworn.oathlessWithout an oath or oaths.oathlikeResembling or characteristic of an oath.oatmealyResembling or full of oatmeal.oatstrawStraw from the oat plant.obductedsimple past and past participle of obductobduracyThe state of being obdurate, intractable, or stubbornly inflexible.obdurantunyieldingly stubbornobdurateStubbornly persistent, generally in wrongdoing; refusing to reform or repent.obeahismAlternative form of obiism.obeahmanA male practitioner of obeah.obedible(obsolete) obedientobedientWilling to comply with the commands, orders, or instructions of those in authority; biddable.obeisantCourteously deferential and respectful.obelisedsimple past and past participle of obeliseobelisksplural of obeliskobelizedsimple past and past participle of obelizeobelizesthird-person singular simple present indicative of obelizeobelusesplural of obelusobeseismdiscrimination against very fat peopleobesogen(pathology) A chemical or other factor that disturbs the body's normal processes, causing it to tend toward obesity.obeyableCapable of being obeyed.obeysantObsolete form of obeisant.obituary(figurative) An announcement or description of the end of something.objectalHaving the form of an object or objects; pertaining to the physical form of something; material.objectedsimple past and past participle of objectobjecteeA person whom somebody else objects to.objectorA person who objects to something.oblatelyIn an oblate manner.oblationThe offering of worship, thanks etc. to a deity.oblativeOf or pertaining to oblation.oblatoryOf or pertaining to oblation; oblationalobleegedsimple past and past participle of obleegeobligantOne who binds themselves to another to pay or to perform something.obligate(transitive) To bind, compel, constrain, or oblige by a social, legal, or moral tie.obligatoAlternative spelling of obbligato.obligersplural of obligerobligingHappy and ready to do favours for others.obligorsplural of obligorobliquesCollectively, the abdominal muscles responsible for rotation of the trunk.obliquid(obsolete) obliqueobliquus(anatomy) An obliquus muscle; a muscle running obliquely.oblivialOf or relating to oblivion.oblivionThe state of forgetting completely, of being oblivious, unconscious, unaware, as when sleeping, drunk, or dead.oblonglyIn an oblong orientation.oblongum(geometry, archaic) A prolate spheroid; a figure described by the revolution of an ellipse about its greater axis.obloquoyMisspelling of obloquy.oblyrate(botany, of leaves) Having a reverse lyrate shape, with the lobes near the apex.obnoxity(uncountable) The quality of being obnoxious.oboelikeResembling or characteristic of an oboe.obrogate(law, rare) To annul a law by enacting a new law, as opposed to repealing the former law.obrotund(literary, rare) Nearly but not completely round; roundish.obrution(geology) A rapid burial or smothering event.obscenercomparative form of obscene: more obsceneobscuredsimple past and past participle of obscureobscurercomparative form of obscure: more obscureobscuresthird-person singular simple present indicative of obscureobscurin(biochemistry) A protein in humans, related to titin and nebulin.obseleteMisspelling of obsolete.obsequieObsolete form of obsequy.observedsimple past and past participle of observeobserveeOne who is observed.observerOne who makes observations, monitors or takes notice.observesthird-person singular simple present indicative of observeobsessedsimple past and past participle of obsessobsessee(rare, informal) One who is the object of someone's obsession.obsessesthird-person singular simple present indicative of obsessobsessorOne who is obsessive about something.obsidian(mineralogy) A type of naturally occurring black glass produced by volcanoes.obsolete(biology) Imperfectly developed; not very distinct.obstacleSomething that impedes, stands in the way of, or holds up progress, either physically or figurativelyobstancy(obsolete) Opposition, impediment, or obstruction.obstructTo block or fill (a passage) with obstacles or an obstacle.obstruse(uncommon, dated) Abstruse.obtainalThe obtaining of something; acquisition.obtainedsimple past and past participle of obtainobtainerOne who obtains.obtected(zoology) Covered with a hard chitinous case, like the pupa of certain files.obtendedsimple past and past participle of obtendobtestedsimple past and past participle of obtestobtrudedsimple past and past participle of obtrudeobtruderSomeone who obtrudes.obtrudesthird-person singular simple present indicative of obtrudeobtundedsimple past and past participle of obtundobtunderThat which obtunds or blunts; especially, that which blunts sensibility.obturateTo block up or obstruct.obtuselyIn an obtuse manner.obtusestsuperlative form of obtuse: most obtuseobtusion(medicine) The blunting, dulling, or weakening of normal sensation.obtusishSomewhat obtuse.obuncous(archaic, very rare) Crooked; bent.obvertedsimple past and past participle of obvertobviableCapable of being obviated.obviatedsimple past and past participle of obviateobviatesthird-person singular simple present indicative of obviateobviatorOne who obviates.obvoluteoverlapping; contorted; convolutedocarinasplural of ocarinaoccashunPronunciation spelling of occasion.occasionA favorable opportunity; a convenient or timely chance.occasive(obsolete) Of or pertaining to the setting sunoccationMisspelling of occasion.occidentThe part of the horizon where the sun last appears in the evening; that part of the earth towards the sunset; the west.occipitaplural of occiputoccisionA killing; the act of killing.occludedsimple past and past participle of occludeoccluderAn object that partially or completely impedes the amount of light reaching the eye.occludesthird-person singular simple present indicative of occludeoccludin(biochemistry) Any of a family of plasma-membrane proteins located at tight junctionsocclusal(dentistry) On the side of a tooth which mates with the opposing tooth.occlusor(anatomy) A muscle that closes an opening.occultedsimple past and past participle of occultocculterAny object, natural or man-made, that blocks the light of an object from an observer, typically used in reference to astronomical events.occulticOf or pertaining to the occult.occultlyIn an occult manner.occupantA person who occupies an office or a position.occupate(rendered obsolete in the end of 17th century, now nonstandard) To occupy.occupiedReserved; engaged.occupierOne who occupies, particularly with respect to a foreign government controlling the territory of another.occupiesthird-person singular simple present indicative of occupyoccuringMisspelling of occurring, present participle of occur.occurredsimple past and past participle of occuroccutard(derogatory, offensive, vulgar, slang, US slang) A protester in the Occupy Wall Street protest movement.oceanautAn explorer in a submarine.oceanbedSynonym of seabed.oceanfulThe amount that an ocean can hold.oceaniteA variety of picrite that is chiefly composed of olivine phenocrysts.oceanitySynonym of oceanicity.oceanium(obsolete) A supposed chemical element, thought to be the one with atomic number 72 (now known as hafnium), but later identified as a mixture of aluminium, iron, and titanium.oceanize(transitive, geology) To cover in ocean.oceanwaySynonym of seaway (“lane or route used by ships at sea”).ocellaryof or relating to the ocellus or ocelliocelloid(microbiology) a cellular structure found in unicellular microorganisms that is analogous in structure and function to eyes, which focus, process and detect lightochazukeAlternative form of chazuke.ocherishAlternative form of ochrish.ocherous(US) Alternative form of ochrous.ochlesid(zoology) Any member of the family Ochlesidae of small shrimp-like crustaceans.ochlesis(medicine) Crowd-poisoning; a disease occasioned or aggravated by overcrowding, especially due to lack of ventilation.ochletic(rare or obsolete) Relating to ochlesis.ochorinaAlternative spelling of ocarina.ochreate(botany) Provided with ocreae, or sheath-formed stipules, such as found in the rhubarb, yellow dock, and knotgrass.ochreishHaving an ochre-like colorochreousAlternative form of ochrous.ochrosol(soil science) A deeply-weathered latosolochterid(zoology) Any insect in the family Ochteridae.ockerdomThe world or sphere of ockers (boorish, uncultivated Australians).ockerishResembling or characteristic of an ocker (boorish, uncultivated Australian).ockerism(Australia) The manners or habits of ockers.ocnophil(psychoanalysis) A personality type characterised by avoidance of dangerous of unfamiliar situations, and the reliance on other people for security.ocotilloAny of various succulent plants, not closely related to the cactus, in genus Fouquieria, especially Fouquieria splendens, living in Central America or the southwest United States.ocreatedAlternative form of ocreate.octacore(computing, of a microprocessor) Composed of eight cores.octacube(geometry) 24-celloctagonsplural of octagonoctagramAn eight-sided star polygon.octaheme(biochemistry) Eight heme groups in a hemoproteinoctairon(chemistry, in combination) Eight iron atoms or cations in a molecule (Fe₈)octalead(chemistry, in combination) Eight atoms of lead in a chemical compound.octalogy(rare) A set of eight works of art that are connected, and that can be seen either as a single work or as eight individual works. They are commonly found in literature, film, or video games.octaloop(genetics) An eight-base hairpin loop motifoctangleA geometric figure with eight corners, an octagon.octanoic(organic chemistry) Of or pertaining to octanoic acid or its derivativesoctanolsplural of octanoloctanone(organic chemistry) Any aliphatic ketone that has eight carbon atomsoctanose(biochemistry) Any monosaccharide having the configuration of an eight-membered ring.octanoyl(organic chemistry, especially in combination) The univalent radical derived from octanoic acid by loss of the hydroxy group; capryloyloctantalRelating to an octant.octapineMisspelling of octopine.octaples(obsolete) Synonym of octapla.octaplexMisspelling of octuplex.octapody(prosody) A metre or verse of eight feet.octapoleAlternative form of octupole.octarchyA group of eight states.octarius(historical) The pint (eighth of a gallon) in the apothecaries' system.octaroonAlternative spelling of octoroon.octasomeAny one of eight homologous chromosomes in an aneuploid complementoctavate(music) To sound one octave higher or lower.octavina(music) A stringed musical instrument resembling the guitar.octavingAn audio effect in which a signal is combined with another version of itself that is an octave higher or lower.octavius(historical) Alternative form of octarius (the pint (eighth of a gallon) in the apothecaries' system)octawordMisspelling of octoword.octenary(mathematics) Octal; base eight.octeract(mathematics) An eight-dimensional hypercubeoctobass(music) A very large bass requiring two musicians, one to finger and one to bow.octocore(computing, of a microprocessor) Composed of eight cores.octodont(zoology) Of or pertaining to the Octodontidae, a family of rodents including the degu (Octodon degus) and 12 other South American species.octofoilHaving eight lobes or leaves.octogamyThe state of having eight spouses simultaneously.octogram(geometry) A regular eight-pointed star shape.octologyAlternative spelling of octalogy.octomino(geometry) A polyomino consisting of eight squares.octonaryOf eighth rank or order.octonianMisspelling of octonion.octonion(mathematics) An 8-dimensional nonassociative extension of a quaternion with a real part and 7 imaginary parts (each a real multiple of a distinct square root of −1).octopawnA board game played with four pawns on each side of a 4×4 board.octopeanOf, pertaining to, or resembling an octopus; octopuslike.octopede(zoology) Any eight-legged creature.octopianOf, pertaining to, or resembling an octopus; octopuslike.octopineOf, pertaining to, or resembling an octopus or octopuses; octopuslike.octoplexMisspelling of octuplex.octopode(uncommon) Alternative form of octopod.octopodsplural of octopodoctopoidOf, pertaining to, or resembling an octopus or octopod; octopuslike.octopole(physics) A multipole configuration with eight equal charges arranged in a circular pattern.octopush(UK) The sport of underwater hockey.octopusyResembling an octopus; octopuslike.octoroon(dated or historical) Someone having one-eighth black ancestry.octoword(computing) A numerical value of eight times the magnitude of a word, 128 bits on a 16-bit architecture.octoxide(inorganic chemistry) any oxide having eight oxygen atoms in each molecule or unit celloctulose(organic chemistry) Any octose containing a ketone groupoctupletA group of eight things, particularlyoctuplexHaving eight components.octupole(physics) Anything having eight poles or electrodes, but especially a kind of magnet used for controlling beams of charged particlesoctylene(organic chemistry) octeneoctyloxy(organic chemistry, especially in combination) The univalent radical CH₃-(CH₂)₇-O- derived from octanolocularlyBy means of the eye; visually.oculatedSynonym of oculate.oculesicof or relating to oculesicsoculinid(zoology) Any of the family Oculinidae of stony corals.oculistsplural of oculistocydromeAny beetle of the genus Ocydromus.ocypodanAny crab of the family Ocypodidaeocypodid(zoology) Any crab in the family Ocypodidae.ocythoid(zoology) Any member of the Ocythoidae.odalborn(historical) Inheriting land by odal.odaliqueArchaic form of odalisque.oddballsplural of oddballodditiesplural of oddityoddlingsplural of oddlingoddmentsplural of oddmentodicallyIn terms of the hypothetical force called od.odiouslyIn an odious manner.odobenid(mammalogy) Any of the family Odobenidae; a walrusodometerAn instrument, usually embedded within the speedometer of a vehicle, that measures the distance the vehicle has traveled since production.odometre(nonstandard and now largely obsolete) Alternative form of odometer.odometryMeasurement of distances by the odometer.odonatan(zoology) Any member of the Odonata (dragonflies etc.).odontist(obsolete) dentistodontodeA structure resembling a tooth on the surface of some animalsodontoidResembling a tooth, especially in shapeodontomaA hamartoma of odontogenic origin.odorantsplural of odorantodoriserAlternative form of odorizer.odorizedsimple past and past participle of odorizeodorizerA device to add odor to a gas.odorizesthird-person singular simple present indicative of odorizeodorlessHaving no odor.odorsomeCharacterised or marked by odor(s)odortype(biology) An odor, determined by polymorphic genes, that distinguishes one individual from another of the same species.odostomeAny sea snail of the genus OdostomiaodotopicRelating to odotopyodourantAlternative form of odorant.odourfulAlternative form of odorful.odourousMisspelling of odorous.odysseysplural of odysseyoecobiid(zoology) Any spider in the family Oecobiidae.oecologyArchaic spelling of ecology.oeconomyArchaic spelling of economy.oecumene(UK) Alternative form of ecumene.oedemataplural of oedemaoedipism(medicine) Self-infliction of injury to the eye, especially enucleation.oegopsid(zoology) Any member of the squid order Oegopsida or suborder Oegopsina.oeillade(literary) A glance, especially an amorous one; an ogleoenochoe(historical) A type of Ancient Greek pottery wine jug.oenocyte(biology) A large secretory cell found in clusters underlying the epidermis of larval abdominal segments.oenologyThe scientific study of wines and winemaking.oenophilDated form of oenophile.oerstedsplural of oerstedoestriol(British spelling, biochemistry, steroids) Alternative spelling of estriol.oestroid(entomology) Of or pertaining to the superfamily Oestroideaoestrone(British spelling, biochemistry, steroids) Alternative spelling of estrone.oestrous(British) Alternative spelling of estrous.oestrualRelating to the oestrus.ofcourse(nonstandard, proscribed) Alternative form of of course.offaling(archaic) offaloffboardTo alight, especially from public transit or an aircraft.offbreakAlternative form of off break.offcomer(UK) A newcomer to a place.offencesplural of offenceoffendedsimple past and past participle of offendoffendeeOne who is offended.offenderOne who gives or causes offense, or does something wrong.offendorObsolete form of offender.offensesplural of offenseofferersplural of offererofferinggerund of offerofferorsplural of offerorofffieldAlternative form of off-field.offglide(linguistics) A phase while the articulators are moving away from their position in articulating a speech sound.offgoingDeparting; going away.officersplural of officerofficialOf or about an office or public trust.officinaA monetary office that issues coins.offishlyIn an offish manner.offlinerA person who is offline; one not using the Internet or similar service.offloadsplural of offloadoffprintA reproduction of a single article from a journal or similar publication.offscape(now rare) The distant part of a view, garden etc.; the background.offscour(transitive, rare, archaic) To remove by, or as if by, scouring; to scrub away.offshell(mathematics, physics) That does not conform to classical physics.offshootSomething which shoots off or separates from a main stem or branch of a plant.offshoreMoving away from the shore.offsider(Australia, New Zealand, informal) A partner, assistant, or deputy.offsidesplural of offsideoffsmite(obsolete) To strike off; cut off.offspeedAlternative spelling of off-speed.offsplit(ambitransitive) To split off; secede.offstageOf or relating to that part of a stage not visible to the audience.offstand(transitive) To endure against; stand or ward off; defend against; withstand; resist.offthrewsimple past of offthrowoffthrowThe act of throwing off; (by extension) liberationofftopicAlternative form of off-topic.offtrackAlternative spelling of off-track.offwhiteAlternative form of off-white.offworld(chiefly science fiction) Not on Earth.ofspringObsolete spelling of offspring.oftenest(dated) superlative form of often: most oftenofttimes(chiefly US, uncommon) (elsewhere, archaic) Often, frequently.oghamistAlternative letter-case form of Oghamist.oglesome(rare) Alternative form of ogglesome.ogrelikeResembling or characteristic of an ogre.ogrishlyIn an ogrish manner.ohmilite(mineralogy) A monoclinic-prismatic light pink mineral containing hydrogen, iron, oxygen, silicon, strontium, and titanium.ohmmeter(physics) A portable device for measuring relatively small values of electrical resistance.oikology(dated) The science of houses and homes, considered especially in respect of their sanitary conditions.oikumeneThe civilized world or inhabited world; the location and time in the known world where human civilization exists.oilbirdsplural of oilbirdoilcakesplural of oilcakeoilclothA fabric or cloth treated on one side with a waterproof covering, especially one made from linseed oil etc.; used for flooring, tablecloths, kitchen shelves and sometimes furniture covering.oilfieldAlternative spelling of oil field.oilhouseA building for storing and dispensing fuel oil.oilinessThe quality of being oily.oilpalmsplural of oilpalmoilpaperA translucent, waterproof paper made by soaking in oil.oilpatchA patch or puddle of oil.oilproofResistant to oil.oilsandsplural of oilsandoilseedsplural of oilseedoilskinsA waterproof garment, made from oilskin, used especially at sea.oilsmokeSmoke from burning oil; especially, such smoke that is thick and black.oilstoneA type of stone used for sharpening objects such as knives and razorblades.oilstoveA stove or heater that burns kerosene.oiltightSo tightly made that oil cannot enter or escape.oilwellsplural of oilwelloilwomanA female oilman; a woman involved in oil production or delivery.oilworksA factory producing oil (whether petroleum, oil shale, or vegetable oils).oinochoeAlternative form of oenochoe.oinokhoeAlternative form of oenochoe.oinologyAlternative spelling of oenology.ointment(medicine) A viscous preparation of oils and/or fats, usually containing medication, used as a treatment or as an emollient.oisivity(obsolete, rare) indolence; idlenessoithonidAny copepod of the family OithonidaeoiticicaThe tree Licania rigida, endemic to Brazil and Puerto Rico.ojousama(Japanese, usually fiction) A rich girl.okamisan(sumo) The wife of a stablemaster who oversees all activities except coachingokavirusAny virus of the genus Okavirus that infects crustaceansokayness(informal) The state or condition of being okay; adequateness, tolerableness.okeydokeAlternative form of okey-doke.okolehaoA distilled beverage made from the ti root, and often containing other ingredients, such as sugar cane and pineapple.okroshkaA cold raw vegetable soup, part of the national cuisines of Russia and Ukraine. Usually made by pouring kvass or kefir in a pot of diced cucumber, radish, green onion, boiled potato, boiled egg, sausage or meat, sour cream, and seasoned with dill and parsley.olaparibA particular anticancer drug.oldcomerAn immigrant or the descendant of immigrants who has lived in their new environment long enough to become well-established.oldskoolAlternative form of old skool (“hip-hop or rap music of the late 1970s and 1980s (or more recent music of this style) as contrasted with newer styles of such music”) (alternative spelling of old school).oldspeakStandard English, not newspeakoldsquaw(dated, offensive) The long-tailed duck, a medium-sized seaduck: Clangula hyemalis.oldstersplural of oldsteroldstyle(typography, often attributive) A traditional style of typeface designed to mimic the handwriting of scribes.oldtimerAn elderly person.oleacein(organic chemistry) The phenolic ester 2-(3,4-dihydroxyphenyl)ethyl (Z)-4-formyl-3-(2-oxoethyl)hex-4-enoate present in olive oiloleamideAn endogenous amide of oleic acid that induces sleep in animals.oleanane(organic chemistry) A natural triterpene forming the central core for a wide variety of chemical compounds in flowering plantsoleanderNerium oleander, a notoriously poisonous shrub in the dogbane family, Apocynaceae, but nonetheless widely grown as an ornamental, having leathery lance-shaped leaves and deep rose-colored or white flowers.oleasideAny of a particular group of steroid glycosides.oleasomeMisspelling of oleosome.oleasterA plant in the family Elaeagnaceae,olefiantThat produces oilolefinicCharacteristic of, or containing olefins.oleoside(organic chemistry) Any of a particular class of secoiridoid glycosideoleosity(obsolete) The state or quality of being oily or fat; fatness.oleosomeSynonym of spherosome.olfacticReferring to the olfactory senses or the sense of smell.olfactorA smelling organ; a nose or similar organ.olibanumA gum resin from trees of the genus Boswellia, formerly used as a medicine and now mainly as incense.oligarchA member of an oligarchy; someone who is part of a small group that runs a country.oligemiaAlternative form of oligaemia.oligemicRelating to or exhibiting oligemia.oligoene(organic chemistry) Any compound having many carbon-carbon (conjugated) double bonds (such as a carotenoid)oligomer(chemistry) A compound intermediate between a monomer and a polymer, normally having a specified number of units between about five and a hundred.oligonolA mixture of low-molecular-weight polyphenols found in the lychee.oligoyne(organic chemistry) Any compound having many carbon-carbon (conjugated) triple bondsoliguria(medicine) A decreased production in the volume of urine.oliguricRelating to oliguriaoliphantAn ancient ivory hunting-horn.olitorinA particular steroid glycoside.olivanicOf or pertaining to olivanic acids or their derivativesolivetol(organic chemistry) 5-pentylresorcinol or 5-pentyl-1,3-benzenediol, an organic compound found in certain lichens. It is also a precursor in various syntheses of tetrahydrocannabinol.olivettaA container used to hold olives.olivinesplural of olivineolivinicOf or relating to the mineral olivine.ologistsplural of ologistolorososplural of olorosooltipraz4-methyl-5-(2-pyrazinyl)-3-dithiolethione, a schistosomicide drug also used in tumour prevention.olympiadAlternative letter-case form of Olympiad.olympite(mineralogy) An orthorhombic-disphenoidal colorless mineral containing lithium, oxygen, phosphorus, and sodium.omadhaun(Ireland) A fool, someone who is out of their senses, simpleton.omasitisinflammation of the omasumombrellaObsolete form of umbrella.omeletteTo make into an omeletteomeletty(informal) Resembling or characteristic of an omelette.omenlessWithout an omen.omission(uncountable) The act of omitting.omissivetending to omit thingsomittingpresent participle and gerund of omitommateal(zoology, archaic) Of or pertaining to an ommateum (compound eye).ommateum(zoology, archaic) A compound eye, found on, for example, insects and crustaceans.ommatidiAlternative form of ommatidia.omniapan(fandom slang) A theoretical member of all amateur press associations.omniarchA ruler of the world or everything.omnicide(countable, rare) Someone or something that causes total destruction.omnicronMisspelling of omicron.omnifickObsolete form of omnific.omniformHaving every form or shape.omnigamyA social system in which each man of a community is married to all the women and each woman is married to all the men.omniglot(rare, theoretically) A person or entity who has mastered all languages.omnitudeThe fact or condition of being all.omnivertA person who fits into both extremes of the extroversion-introversion personality spectrum.omnivoreAn animal which is able to consume both plants (like a herbivore) and meat (like a carnivore).omnivoryThe consumption of both animal and plant matter, or of material from multiple trophic levels; the act or condition of being omnivorous.omnomnomAlternative form of om nom nom.omodynia(medicine) pain in the shoulderomohyoid(anatomy, relational) Of or relating to the shoulder and the hyoid bone.omoideumThe pterygoid bone.omolanke(West Africa) A pushcart.omomyineAny extinct primate of the clade †OmomyinaeomophagyThe eating of raw flesh.omoplate(anatomy, dated) The scapula.omorashi(Japanese pornography, paraphilia) A paraphilia or sexual practice involving arousal from the feeling of one or someone else having a full urinary bladder, sometimes including erotic denial of bathroom access.omosudid(ichthyology) Any fish in the family Omosudidae, which consists of a single known species, the deep-sea hammerjaw (Omosudis lowii).omphalicOf or pertaining to the umbilicus, or navel.omphalosAn ancient religious stone artifact, or baetylus, used to denote the direction of the "center" of the world.omphalusAlternative form of omphalos.omurambaA watercourse, which may be dry much of the year, in the Kalahari Desert.onanismsplural of onanismonanistsplural of onanistonballer(Australian rules football) Any of the three players (the ruckman, ruck rover, and rover) who usually follow the ball around the ground rather than occupying a fixed position.oncenessThe state or condition of being once; singularity.oncidium(botany) Any of the genus Oncidium of tropical orchidaceous plants.oncocyteA large, granular cell, having many mitochondria, found in salivary and certain endocrine glands.oncogene(oncology, genetics) Any gene that contributes to the conversion of a normal cell into a cancerous cell when mutated or expressed at high levels.oncolite(geology) a spherical sedimentary structure formed by cyanobacteriaoncologyThe branch of medicine concerned with tumors, including study of their development, diagnosis, treatment, and prevention.oncomingApproach, onsetonconase(biochemistry) An antitumor ribonuclease proposed for use in chemotherapyoncoplot(genetics) A diagrammatic representation of genetic mutationsoncosomeA membrane-derived microvesicle that is secreted by cancer cells and transfers oncogenic messages and protein complexes across cell bordersoncotomy(surgery) The opening of an abscess, or the removal of a tumour, with a cutting instrument.oncotypeAny specific type of cancer, characterised by a specific testondogramThe recording produced by an ondograph.ondoyant(art) wavy; having the surface marked by waves or slightly depressed furrowsondulateMisspelling of undulate.oneberryParis quadrifolia, herb paris.oneirism(psychiatry) A state of abnormal consciousness in which dream-like experiences and hallucinations happen while awake.oneiroid(medicine) Characterized by a dream-like or nightmare-like state, often as part of schizophrenia.onelinerAlternative form of one-liner.onescore(archaic, rare) Twenty (20).oneshotsplural of oneshotonesidedAlternative spelling of one-sided.ongaongaThe plant Urtica ferox, a nettle endemic to New Zealand with woody stem and large stinging spines.onglidesplural of onglideongoingsplural of ongoingonhangerThat which, or one who, hangs on to, relies on, or is dependent upon another; a dependent.oniscoid(zoology) A member of the Oniscoidea; a woodlouse.onliness(archaic) The state of being alone or unique.onlookerA spectator; someone looks on or watches, without becoming involved or participating.onlybornBorn as the only child in a family, flock, or the like.onlyhoodthe condition of being unique, single, or aloneonnagataA male actor who plays female roles in Japanese kabuki theatre.onocerin(organic chemistry) A white crystalline waxy substance extracted from the root of the leguminous plant spiny restharrow (Ononis spinosa).onolatryWorship of the ass or donkey.onomancydivination by the letters of a name; nomancyonrushesplural of onrushonscreenAs seen on a screen (as of television, film, or computer) rather than in real life.onsetter(mining, historical, UK, dialect, Northern England) A worker at the bottom of a mineshaft who exchanges the empty and full corves.onstreamBeing producedonticity(philosophy, metaphysics) One's ontic attributes.ontogenySynonym of ontogenesis.ontogramA graphical representation of an ontology (branch of knowledge)ontology(logic) A logical system involving theory of classes, developed by Stanislaw Lesniewski (1886-1939).ontonomyA philosophy of existence that emphasizes the harmonious coexistence of nonuniform entities.ontotype(genetics) The hierarchical form of a genotypeonyxitisAlternative form of onychitis.oocyesis(medicine, archaic, uncommon) Ovarian pregnancy: the type of ectopic pregnancy that occurs within an ovary.oofamily(taxonomy) An ootaxon, equivalent to a family, used to classify fossilised dinosaur eggsoofiness(UK, slang, dated) The quality of being wealthy.oogameteThe female gamete; the egg cell or oosphere.oogamousOf or relating to oogamyoogonialof or pertaining to an oogoniumoogoniolA particular fungal sex hormone.oogonium(biology) An immature ovarian egg within a developing fetus.ookinete(zoology) The motile zygote of a parasite of the malaria mosquito that forms an oocyst in the mosquito's gutoolachanAlternative form of eulachon.oolichanAlternative form of eulachon.oolithicRelating to ooliths.oologistA person who studies or specializes in oology.oomycete(biology) Any of a number of filamentous unicellular protists of the class Oomycetes; the water molds.oomycideAny substance that kills oomycetes.oomycoteAny of a group of filamentous protists variously classified as the phylum Oomycota or the class Oomycetes in a more broadly circumscribed phylum.oophagicSynonym of oophagous.oophoric(botany) Having the nature of, or belonging to, an oophore.oophoron(medicine) Synonym of ovary.oophyticof, pertaining to or characteristic of an oophyteoosphere(botany, mycology) A large nonmotile egg cell, especially of an alga or fungus, formed in an oogonium and ready for fertilization.oosporesplural of oosporeoosporicRelating to the oospore.oostasisThe failure of (typically insect) eggs to form or to developoostaticRelating to, or causing oostasisoothecaeplural of oothecaoothecalRelating to an ootheca.oozinessThe state or condition of being oozy.oozinglyIn an oozing manner.opacious(chiefly archaic) Opaque.opacular(obsolete) opaqueopalesceTo be opalescent; to produce or show a play of colors, like an opal.opalinid(zoology) Any heterokont in the family Opalinidae.opalizedsimple past and past participle of opalizeopalwareA form of opaque toughened glass used for dinnerware.opaquelyIn an opaque manner.opaquestsuperlative form of opaque: most opaqueopdalite(mineralogy) A charnockitic form of granodioriteopenableCapable of being opened.openband(textiles, of a twist) Right-handed or "Z shaped", with individual fibers pointing up and to the right when the thread, yarn, or rope is vertical.openbillEither of two species of bird in the genus Anastomus of the stork family Ciconiidae, with a distinctive gap between the mandibles of the closed bill.opencast(chiefly British) Of or pertaining to strip mining, in which material is removed from a surface that has been exposedopenhand(transitive) To hit with an open hand.openingsplural of openingopennessThe degree to which a person, group, organization, institution, or society exhibits this liberal attitude or opinion.openningMisspelling of opening.openside(rugby) The space on the side of the pitch with the larger distance between the breakdown/set piece and the touchline.opentureRefraining from seeking a resolution or ending for an emotionally difficult experience.openwashTo market something as open (without proprietary licensing) when it does not meet all the criteria of openness.openworkAny of several forms of metalwork or needlework having decorative openings.operableAble to be operated or used.operably(medicine) Such that it allows an operation to take place.operadic(mathematics) Of or pertaining to operads.operanceoperation; workings (the act of operating or working)operancyThe quality of being operative.operandsplural of operandoperantsplural of operantoperatedsimple past and past participle of operateoperateeSomeone who has an operation.operatesthird-person singular simple present indicative of operateoperaticOf, related to, or typical of opera.operatorA person or organisation that operates a device, system, service, etc.opercledHaving an opercle.operculaplural of operculumoperculeAlternative form of operculum.operetta(music) A lighter version of opera with a frivolous story and spoken dialogue. [from 18th c.]operetteAlternative form of operetta (“light opera”).operonicRelating to operonsopheliid(zoology) Any polychaete worm of the family Opheliidae.ophiasis(dermatology) A form of alopecia areata characterized by the loss of hair in the shape of a wave at the circumference of the head.ophidianAny species of the suborder Serpentes; a snake or serpent.ophidiidAny in the family Ophidiidae of cusk-eels.ophidine(organic chemistry) The dipeptide β‐alanyl‐L‐3‐methylhistidineophidismPoisoning by snake venom.ophiuran(zoology, dated) Of or relating to the Ophiuroidea.ophiuridArchaic form of ophiuroid.opianine(organic chemistry) An alkaloid found in small quantities in opium, identical with narcotine.opiatingpresent participle and gerund of opiateopificer(obsolete) A person who creates or makes something.opinableCapable of being opined or thought.opinator(obsolete) An opinionated person, or someone who holds an opinion.opiniate(obsolete) To hold or maintain persistently.opinicus(heraldry) A heraldic imaginary creature with an eagle's head, a short tail, and sometimes wings.opinionsplural of opinionopiumism(dated) Opium addiction.opiumist(archaic) One who is addicted to opium.opomyzid(zoology) Any fly of the family Opomyzidae.opopanaxA perfume made from the gum resin of various trees.opoponaxAlternative form of opopanax.opossumsplural of opossumoppeliid(zoology) Any member of the Oppeliidae.oppilate(obsolete, medicine) To block, to stop up, to obstruct.opponens(anatomy) Short for opponens digiti minimi (“a muscle of the hand”).opponentOne who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.opponingpresent participle and gerund of opponeopposersplural of opposeropposideA particular steroid glycoside.opposingThat opposes or oppose; on the opposite side.oppositeLocated directly across from something else, or from each other.opprobry(obsolete) Opprobrium.oppugnerSomeone who oppugns; an opponent.oprationMisspelling of operation.opsigamy(rare) marriage at an old ageopsimath(rare) A person who learns late in life.opsonifySynonym of opsonize.opsoniseAlternative spelling of opsonize.opsonistA practitioner of opsonotherapy.opsonize(transitive) To make (bacteria or other cells) more susceptible to the action of phagocytes by use of opsonins.opsonoid(biology, obsolete) A supposed substance formed when opsonin combines with bacteria and undergoes heating, preventing further opsonization.optation(obsolete) A wish; a desire.optativeExpressing a wish or a choice.opticalsplural of opticalopticianA person who makes, dispenses or sells lenses, spectacles.opticistOne who studies optics.opticityThe degree of optical activity of a solutionoptimacygovernment by the nobilityoptimate(historical) A member of the patrician ruling class in republican Ancient Rome; an aristocrat, a noble.optimiseNon-Oxford British English standard spelling of optimize.optimisma tendency to expect the best, or at least, a favourable outcomeoptimistA person who expects a favourable outcome.optimityThe state of being best.optimize(originally intransitive) To act optimistically or as an optimist.optionalNot compulsory; left to personal choice; elective.optionedsimple past and past participle of optionoptioneeThe purchaser of a financial option.optionerAlternative form of optionor.optionorThe grantor of a financial option.optogram(physiology) An image of external objects fixed on the retina by the photochemical action of light on rhodopsi.optology(rare) The study of sight.optotypeA standardized symbol for testing vision.optronicoptoelectronicopulenceAbundance, bounty, profusion.opulencyArchaic form of opulence.opusculaplural of opusculumopusculeA small or petty work.oracallySynonym of oracularly.oracularOf or relating to an oracle.oragious(archaic) stormyoralizerOne who oralizes.oralmost(anatomy) Located furthest in the oral direction.oralnessThe quality or condition of being oral.orancayaAlternative form of orankay.orangeat(obsolete) Candied orange peel.orangeloA citrus fruit that is a cross between an orange and a grapefruit.orangelyIn an orange manner.orangeryA greenhouse in which orange trees are grown.orangishRelatively orange in colour.orangite(mineralogy) An orange-yellow variety of thorite, found in Norway.orangoid(anatomy) Resembling (that of) an orangutan.orationsplural of orationoratoricAlternative form of oratorical.oratorio(music) A musical composition, often based on a religious theme; similar to opera but with no costume, scenery or acting.oratress(dated) A female oratororbatideA group of bioactive cyclic ribosomally synthesized and posttranslationally modified peptides of natural plant sourcesorbation(obsolete) The state of being orbate, or deprived of parents or children; privation, in general; bereavement.orbicula(zoology, dated) A discina (brachiopod).orbicule(geology) An inclusion in an igneous rockorbifold(topology) A topological space in which every small enough neighborhood is homeomorphic to a quotient of real space by the action of a finite group.orbiform(geometry) A plane for which the distance between the points of contact of two nonequal parallel tangents at a circle is the same everywhere.orbiniid(zoology) Any polychaete worm of the family Orbiniidae.orbitalsplural of orbitalorbitaryPertaining to an orbit; orbital.orbitersplural of orbiterorbitingpresent participle and gerund of orbitorbitoidAny foraminifer of the family Orbitoididae.orbitrapA mass analyzer consisting of an outer barrel-like electrode and a coaxial inner spindle-like electrode that traps ions in an orbital motion around the spindle. The image current from the trapped ions is detected and converted to a mass spectrum using the Fourier transform of the frequency signal.orbitude(obsolete) bereavement or loss of parents or childrenorcelite(mineralogy) A hexagonal-dihexagonal pyramidal orange white mineral containing arsenic and nickel.orchanetAlternative form of alkanet (“Alkanna tinctoria”).orchardsplural of orchardorchardy(informal) Resembling or characteristic of an orchard.orchellaarchil, orchil lichenorchesisThe act and/or art of dancing.orchideaSynonym of orchid.orchisesplural of orchisorchiticRelating to orchitis.orchitis(pathology) A painful inflammation of one or both testes.ordainedEstablished by authority.ordaineeOne who is ordained.ordainerA person (usually a clergyman) who ordains.ordalian(law, obsolete) Of or relating to trial by ordeal.ordalium(obsolete) Trial by ordeal.orderersplural of ordererorderingpresent participle and gerund of orderorderite(rare) A member of an order.ordinaleAlternative form of ordinal (religious book)ordinalsplural of ordinalordinandA candidate for ordination.ordinantOrdaining; decreeing.ordinaryA person with authority; authority, ordinance.ordinate(geometry) The vertical line representing an axis of a Cartesian coordinate system, on which the ordinate (sense above) is shown.ordnance(collective) Military equipment, especially weapons and ammunition.ordurousFilthy; revolting.orectiveSynonym of orectic.orefield(mining) land from which ore is minedorehouseA building for the storage of ore.orelline(organic chemistry) A yellow pigment derived from Bixa orellana with IUPAC name 3-hydroxy-2-(3-hydroxy-4-oxo-1H-pyridin-2-yl)-1H-pyridin-4-one.oreodine(organic chemistry) A diterpene alkaloid found in the plant Delphinium oreophilum.oreodont(paleontology) A member of the extinct genus †Oreodon or extinct superfamily †Merycoidodontoidea of ruminating hogs.oreoline(organic chemistry) A diterpene alkaloid found in the plant Delphinium oreophilum.oreologyAlternative form of orology.oreshoot(geology) An elongated body of ore that follows a vein.orexigenAny orexigenic substanceorfamide(organic chemistry) Any of a class of cyclic lipopeptide lactones present in some Pseudomonas bacteriaorgandieAlternative spelling of organdy.organickObsolete form of organic.organicsplural of organicorganify(biology, transitive) To stabilize (a material) within an organ.organiseNon-Oxford British standard spelling of organize.organism(biology) A discrete and complete living thing, such as animal, plant, fungus or microorganism.organistA musician who plays the organ.organityThe quality or state of being an organism.organize(transitive) To arrange in working order.organoidResembling an organ of the body.organule(anatomy, dated) One of the essential cells or elements of an organ.organzasplural of organzaorgasmedsimple past and past participle of orgasmorgasmerA person who orgasmsorgasmic(not comparable) Of or relating to orgasms.orgasticOrgasmic (exciting or stimulating; relating to or prone to orgasm).orgonomyThe study of orgone.orgulity(obsolete) prideorgulousArrogant, haughty, proud.orgygoer(rare) Alternative form of orgy-goer.oribatid(zoology) Any of a group of mites of the suborder OribatidaorichalcAlternative form of orichalcum.orickite(mineralogy) A hexagonal brass yellow mineral containing copper, hydrogen, iron, oxygen, and sulfur.oricycleAlternative form of horocycle.oridoninA medically useful diterpenoid found in Rabdosia rubescens.orielled(architecture) Furnished with an oriel.orienate(transitive, reflexive) To orientate (oneself/something), be able not to get lost.orientalAlternative letter-case form of Oriental.orientedHaving a specific orientation (positioning or direction).orientee(US, especially medicine) Synonym of trainee: a new employee undergoing a probation period of training and evaluation ("orientation").orienterA person or thing that orients.orientin(organic chemistry) A flavone that is a glucoside of luteolin.orificalOf, or pertaining to an orifice.orificesplural of orificeoriflambArchaic spelling of oriflamme.origamicPertaining to origami.origanumAny herbaceous plant of the genus Origanumoriginal(not comparable) Relating to the origin or beginning; preceding all others.orillionAlternative form of orillon.orinasal(phonetics) A speech sound produced using both the mouth and the nose.orlistatA drug designed to treat obesityormering(Channel Islands) The gathering of ormers; ormer-collecting.ormesineAlternative form of armozeen.ornamentAn element of decoration; that which embellishes or adorns.ornatelyIn an ornate manner.ornative(grammar) A noun case that means "endowed with" or "supplied with".ornatrixA tirewoman, an adorner.ornature(archaic) Decoration; ornamentation.orneodid(zoology) Any moth in the family Orneodidae, a synonym of the Alucitidae.orneriercomparative form of ornery: more orneryornerilyIn an ornery manner.ornithicOf or pertaining to birds.ornithonAn aviary; a poultry house.orocline(geology) A mountain belt whose process of deformation is visible.orofecal(medicine, of a disease) transmitted from feces to the mouth.orogenic(geology) Concerned with orogeny; pertaining to the creation of mountains.orograph(surveying) A machine for use in making topographical maps, operated by being pushed across country, and recording distances and elevations.orometerAn aneroid barometer having a second scale that gives the approximate elevation above sea level of the place where the observation is made.oromotor(anatomy) Relating to the movement of the mouth.oronasalOf or pertaining to the mouth and the noseorophyte(biology) Any plant that grows in a subalpine habitat.oroxylin(organic chemistry) Any of a group of methylated flavones present in plants of the genus OroxylumorphancyThe state of being an orphan.orphanedMade an orphan by the death of one's parents.orphaner(dated) Synonym of orphan.orphanet(dated, rare) A young or little orphan.orphaninSynonym of nociceptin.orphanry(rare) The state of being an orphan.orpheite(mineralogy) A trigonal-hexagonal scalenohedral mineral containing aluminum, hydrogen, lead, oxygen, phosphorus, and sulfur.orpimentArsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment.orreriesplural of orreryorseilleorchil (lichen or dye)orthaganAny pyralid moth of the genus Orthaga.orthesisAn orthopedic prosthesisorthiconAn early TV camera tube. (Abbreviation of orthoconoscope).orthidicRelating to orthids.orthodoxConforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology.orthoepyThe study of pronunciation.orthogon(geometry) A right-angled triangle.ortholog(genetics) Any of two or more homologous gene sequences found in different species related by linear descent.orthonymThe real name of a person who uses a pseudonym.orthoped(medicine, informal, humorous) Synonym of orthopod.orthopia(medicine) Normal vision; an absence of a visual disorder.orthopnyDated form of orthopnoea.orthopod(medicine, informal, humorous) An orthopaedic surgeon.orthopox(pathology) Infection with an orthopoxvirus.orthosesplural of orthosisorthosiaAny moth of the genus Orthosiaorthosis(medicine) A type of brace which either prevents or assists movement of a limb or the spine.orthoticOf or pertaining to orthotics.orticantThat irritates the skinortolansplural of ortolanortsteinA hardpan, typically in a podzolorvietan(historical) A medicinal preparation made from herbs, wine and honey, thought to be an antidote for any poison.oryctere(archaic) The aardvark.orycticsThe branch of geology relating to fossils.oryzalinA selective herbicide used to control annual grasses etc. in food cropsoryzanolAn antioxidant found in rice bran oil.oryzenin(biochemistry) A glutelin that is the main protein in riceosarsite(mineralogy) A monoclinic-prismatic gray mineral containing arsenic, osmium, ruthenium, and sulfur.oscillon(physics) A form of soliton observed in a granular environment.oscinine(ornithology) Of or pertaining to the Oscines, or songbirds (birds of the clade Passeri).oscitantyawning or gapingoscitate(archaic) To gape or yawn.osculantKissing; hence, touching or meeting; clinging.osculate(ambitransitive) To kiss.osetrovaSynonym of osetra (“type of caviar”).oshiboriA moist towel for cleaning the hands, offered to customers in Japanese restaurants and bars.oslerianMisspelling of Oslerian.osmazome(chemistry, dated) A substance formerly supposed to impart the characteristic meaty smell and taste to certain dishes.osmicate(transitive) To stain or impregnate with osmic acid.osmogeneAn apparatus, consisting of a number of cells whose sides are of parchment paper, for conducting the process of osmosis. It is used especially in sugar refining to remove potassium salts from the molasses.osmoliteMisspelling of osmolyte.osmologyThe scientific study of smells.osmolyte(biology) Any substance that contributes to the (regulation of) osmotic pressure in cells and tissuesosmosingpresent participle and gerund of osmoseosmostatThe mechanism, in the hypothalamus, that regulates osmolality by the secretion of antidiuretic hormoneosmoticsThe study and measurement of osmotic pressureosmylate(chemistry) To react with osmium tetroxide.osnaburg(now chiefly US) A plain, coarse textile fabric made from flax, tow or jute yarns.osoberryA plant of species Oemleria cerasiformis (Indian plum), a shrub native to the Pacific coast and ranges of North America.ossamine(organic chemistry) Any aminosugar that is a constituent of ossamycinossatureA skeletal framework; an underlying structure.ossiclesplural of ossicleossiconeEither of the horn-like protuberances on the heads of giraffes and male okapi. Some extinct species in the family bore antler-like ossicones.ossiculeAlternative form of ossicle.ossicusp(zoology) The bony horn of an okapi or a giraffe.ossifiedHaving undergone the process of ossification (transformation into bone or a bone-like mass).ossifierOne who, or that which, ossifies.ossiform(anatomy, medicine) Resembling bone.ossobucoAlternative spelling of osso buco.ostalgia(pathology) Synonym of ostealgia.osteiticRelating to osteitis.osteitis(pathology) inflammation of boneosteogen(physiology) The soft tissue, or substance, which, in developing bone, ultimately undergoes ossification.osteomasplural of osteomaosteonalOf or pertaining to osteonosteonicRelating to osteonsosteosisosteogenesis; bone formationostiallyWithin an orifice or ostiumostinatiPlural of ostinato.ostinato(music) A piece of melody, a chord progression, or a bass figure that is repeated over and over as a musical accompaniment.ostiolarOf or pertaining to the ostiole.ostmarksplural of ostmarkostomateA person who has had an ostomy, a surgical operation to create an opening in the body for the discharge of body wastes.ostomiesplural of ostomyostracodAny of many small crustaceans, of the class Ostracoda, that resemble a shrimp enclosed in a bivalve shell.ostraconA piece of pottery or stone, usually broken off from a vase or other earthenware vessel, especially one used to cast a vote during the Ancient Greek process of ostracism.ostracum(archaeology) A fragment of pottery.ostrakonAlternative form of ostracon.ostregerObsolete form of austringer.ostrichyResembling or characteristic of an ostrich.ostridgeObsolete form of ostrich.ostruble(historical) A former currency of Germany and Lithuania in the 1910s and 1920s.otakudomotakus collectivelyotakuismThe obsessive interest of an otaku, especially an interest in anime or manga.otakukin(dated, Internet, sometimes capitalized) A person who claims or believes that their soul is a reincarnation or parallel incarnation of a fictional character (especially, from anime, manga, or video games).otariineAlternative form of otarine.otectomyThe surgical removal of (part of) the ear.otherdom(rare) The state, condition, or existence of others; the tendency toward preferring, serving, or doing for others; selflessness.otherhow(dialect) By other means.othering(philosophy, politics) gerund of other: the process of perceiving or portraying someone or something as essentially alien or different.otheriseAlternative form of otherize.otherishPertaining or belonging to another kind; different.otherize(transitive) To make or regard (a person, social group, etc.) as alien or different.otherkinA person who believes their soul, essence, or identity is non-human.otiatricRelating to otiatrics.otilimabA human antibody medication used in treating autoimmune diseases such as multiple sclerosis and rheumatoid arthritis.otioselyIn an otiose manner.otiosityThe state or quality of being otiose.otkaznik(historical) Synonym of refusenik.otoconin(biochemistry) Any of a group of matrix proteins present in otoconiaotocrane(archaic, anatomy) The bony labyrinth.otocystsplural of otocystotodynia(pathology) Earache.otogelin(biochemistry) A glycoprotein of the acellular gel of the inner earotogenicoriginating in the earotolithsplural of otolithotoliticArchaic form of otolithic.otologicSynonym of otological.otometryA method of setting hearing aid gain based on most comfortable loudness.otomorphAny fish of the cohort Otomorphaotopathy(pathology) Any disease of the earotorrhea(medicine) Discharge of fluid from an external ear.otoscope(medicine) An instrument used for examining the eardrum and interior of the outer ear.otoscopy(medicine) The visual examination of the inner ear using an otoscopeotosteal(anatomy) An auditory ossicle.otosteon(zoology, anatomy, medicine) Synonym of otolith.ototoxicCausing ototoxicity.ototoxinAny ototoxic agent.ottariidAny sea lion of the family Otariidaeottavino(music) A miniature virginal, pitched one octave higher than the larger version.otteringThe hunting of otters.otterishOf, pertaining to, or characteristic of an otter.otterpox(dialectal, rare) A friction blister.ottomansplural of ottomanotwayite(mineralogy) A green orthorhombic hydrated nickel carbonate mineral.ouchless(informal) Without pain.oughties(rare, humorous) A decade running from the first year of a century to the tenth.oughtism(informal) The habit of doing things only because one feels that one ought to do them.ouguiyasplural of ouguiyaouistitiAlternative form of wistiti.oulachanAlternative form of eulachon.oulachonAlternative form of eulachon.ouranianAlternative letter-case form of Ouranian.ourayite(mineralogy) An orthorhombic-dipyramidal gray mineral containing bismuth, lead, silver, and sulfur.ouricuriA species of palm tree, Syagrus coronata, endemic to eastern Brazil.ourologyArchaic form of urology.outargue(transitive) To argue better than; to defeat in argument.outarmedsimple past and past participle of outarmoutasiteAlternative spelling of outasight.outbasedBased away from the main base or depot.outbelch(transitive) To belch more or louder than.outbench(transitive) To bench-press more weight than.outbirthA result or consequence.outbitch(transitive, slang) To surpass in bitching, or bitchiness.outblaze(transitive) To shine or burn more brightly or intensely than.outbleat(transitive, rare) To bleat louder or longer than.outbleedThe bleeding or release of air from a system.outbless(transitive) To surpass in giving blessings.outbloom(transitive) To surpass in blooms.outblown(obsolete, poetic) Inflated with wind.outbluff(transitive) To surpass in bluffing.outblushTo exceed in blushing; to surpass in rosy colour.outboardSituated outside the hull of a vessel.outboast(transitive) To boast better than another, to make greater claims about oneself than another makes or is able to make.outbooze(transitive) To outdo in boozing; to drink more alcohol than.outboundLeaving or departing; traveling away from; outward bound.outbowedBowed outward, curved outward.outboxedsimple past and past participle of outboxoutbrain(transitive, informal) To exceed in mental ability; to be cleverer than.outbrake(transitive, motor racing) To brake late in order to get an advantage over.outbraveTo stand out bravely against; to face up to courageously.outbrawl(transitive) To surpass in brawling.outbreakAn eruption; the sudden appearance of a rash, disease, etc.outbreedTo breed from parents not closely related.outbribe(transitive) To surpass in bribery; to bribe more than.outbring(transitive) To bring out; deliver; utter; express.outbrokesimple past of outbreakoutbuild(transitive) To build more or better than.outbulgeTo bulge outward.outbully(transitive) To surpass in bullying.outburstA sudden, often violent expression of emotion or activity.outcallsplural of outcalloutcaper(transitive) To surpass in capering.outcarol(transitive) To surpass in carolling; to sing more or better than.outcarry(transitive) To carry more than.outcasteAn outcast from the caste system.outcastsplural of outcastoutcatch(transitive) To catch more or better than.outcharmTo surpass in charm; to be more charming thanoutchartTo chart higher than.outchase(transitive) To chase better than; to surpass in chasing.outcheat(transitive) To exceed in cheating; to cheat more than.outcheer(transitive) To cheer more or louder than.outclass(transitive) to surpass something or somebody else, so as to appear to be in a higher classoutclimb(transitive) To climb better or farther than.outcoach(transitive) To provide better coaching than (another person or group).outcomerIn China, a person who comes from another place; an outsider.outcomesplural of outcomeoutcount(transitive) To surpass in counting; to count higher than.outcourtAn outer or exterior court.outcrack(transitive) To outbrag; surpass in boasting.outcrawl(transitive) To crawl faster or farther than.outcrazy(transitive, slang) To surpass in craziness; to be more wild or erratic than.outcreep(intransitive) To creep or crawl out.outcriedsimple past and past participle of outcryoutcrierOne who cries out or proclaims; a herald or crier.outcriesplural of outcryoutcropsplural of outcropoutcrossThe introduction of unrelated breeding stock to an existing population, especially one which is inbred or homogeneous.outcrowd(transitive) To crowd out.outcurse(transitive) To surpass in cursing or swearing.outcurve(baseball) A ball, thrown by the pitcher, that curves away from the batter.outcycleTo exceed or outpace in cycling; cycle faster than (another)outdanceTo dance better than; to outdo in dancing.outdatedOut of date, old-fashioned, antiquated.outdatesthird-person singular simple present indicative of outdateoutdevil(transitive) To surpass in devilry.outdodge(transitive) To surpass in dodging.outdoingpresent participle and gerund of outdooutdoorsNot inside a house or under covered structure; unprotected; in the open air.outdraft(nautical) An outward current, often specifically a river current pulling toward a downstream dam.outdranksimple past of outdrinkoutdrawsthird-person singular simple present indicative of outdrawoutdream(transitive) To surpass in dreams or imagination.outdress(transitive) To dress better than.outdrink(transitive) To drink more than (someone else).outdrive(transitive) To drive a vehicle, etc. farther or better than.outdrovesimple past of outdriveoutdwell(transitive, obsolete) To dwell or stay beyond; to outstayouteringAn externalization or outer projection, such as an external technology that extends the natural reach of something.outerweb(ornithology) (of a plumage) an outer weboutfable(transitive) To surpass as a fable; to be more fabulous or fantastical than.outfacedsimple past and past participle of outfaceoutfeast(transitive) To provide with a bigger or better feast than.outfence(transitive) To fence better than (in the sport of fencing).outfield(baseball, softball) The region of the field between the infield and the outer fence.outfightTo fight or battle better than.outflame(transitive, poetic) To burn more brightly than; outshine.outflank(transitive) To maneuver around and behind the flank of (an opposing force).outflare(intransitive) To flare outward.outflash(poetic, transitive) To flash more brightly than; to outshine.outfling(intransitive) To fling outward.outfloat(transitive) To float better than; to surpass in floating.outflownpast participle of outflyoutflowsplural of outflowoutflungFlung outwards.outflush(transitive) To flush out (something).outfoxedsimple past and past participle of outfoxoutfoxerSomeone who outfoxes.outframe(transitive) To frame better than another; exceed or surpass in framing.outfrontAlternative form of out-front.outfrown(transitive) To exceed in frowning.outgasesthird-person singular simple present indicative of outgasoutglare(transitive) To surpass or outdo in glaring.outgleam(transitive) To shine more brightly than.outglide(transitive) To pass or surpass in gliding; to glide beyond.outgloom(transitive, poetic) To be more gloomy than.outgoersplural of outgoeroutgoingExtroverted: talkative, friendly, and social, especially with respect to meeting new people easily and comfortably; outgiving.outgreen(transitive) To surpass in environmental activism or consciousness, to be more conscientious than someone else about not harming the environment, be more green than another.outgross(intransitive) To make a larger gross income or profit than.outgroup(sociology) The group of people who do not belong to one's own social group.outgrownpast participle of outgrowoutgrowsthird-person singular simple present indicative of outgrowoutguard(military) A guard or small body of troops at a distance from the main body of an army, to watch for the approach of an enemy.outguess(transitive) To beat through accurate anticipation of someone's plans and actions.outherodObsolete form of out-Herod.outhomer(baseball) To score more home runs than another player.outhouse(Canada, US) An outbuilding, typically permanent, containing a toilet or seat over a cesspit.outhumor(transitive) To surpass in humor; to be funnier than.outjoust(transitive) To surpass in jousting.outlaborAlternative form of outlabour.outlance(intransitive) To lance outward.outlandsplural of outlandoutlaststhird-person singular simple present indicative of outlastoutlaugh(transitive) To ridicule or laugh someone out of a purpose, principle, etc.; laugh down; discourage or put out of countenance by laughing.outlawed(of an act) put beyond the limits of the law, forbidden, against the law.outlawry(law, historical) A declaration that an individual cannot benefit from the protection of law in a jurisdiction.outlearn(transitive) To surpass (someone) in learning.outliersplural of outlieroutlinedcontaining an outlineoutlinerOne who or that which draws an outline.outlinesplural of outlineoutlivedsimple past and past participle of outliveoutliver(obsolete) A survivor.outlivesthird-person singular simple present indicative of outliveoutlooksplural of outlookoutlyingRelatively remote from some central location.outmagic(transitive) To surpass in the use of magic.outmarch(transitive) To surpass in marching; to march further or faster than.outmatch(transitive) to surpass or be better than something or someone elseoutmetal(transitive) To surpass (an enemy etc.) in terms of firepower.outmodedUnfashionable.outmodesthird-person singular simple present indicative of outmodeoutmountto mount (a horse) quicker thanoutnoiseTo make more noise than.outpacedsimple past and past participle of outpaceoutpacesthird-person singular simple present indicative of outpaceoutpaint(transitive) To paint more or better than; to surpass in painting.outpitch(baseball) To pitch better than an opposing pitcher.outplaceTo terminate a person's employment, but help the former employee to obtain another post.outplant(transitive) To surpass in plantingoutplaysthird-person singular simple present indicative of outplayoutplead(transitive) To surpass in pleading; to plead more successfully than.outpoint(sports) To score more points than (especially, in boxing, to achieve victory by scoring more points that one's opponent).outpoise(archaic, transitive) To outweigh.outportsplural of outportoutpostsplural of outpostoutpower(transitive) To surpass in power.outpreen(transitive) To surpass in preening.outpress(transitive, rare) To push or force outward.outprice(transitive) To sell at a lower price than (another seller).outprint(transitive) To print more or better than; to surpass in printing.outprize(transitive, obsolete) To prize beyond value, or excessively.outpsych(transitive) To overcome or intimidate by psychological means.outpunch(transitive) To punch harder or better than.outquote(transitive) To surpass in quotation.outracedsimple past and past participle of outraceoutracesthird-person singular simple present indicative of outraceoutragedsimple past and past participle of outrage.outragerOne who outrages.outragesplural of outrageoutraise(transitive) To raise more of something than (someone else); often used specifically in reference to fundraisingoutrance(obsolete) The furthest degree or extremity, going beyond bounds or propriety.outrange(transitive) To have a longer range than (another projectile or weapon).outranksthird-person singular simple present indicative of outrankoutreachThe act of reaching out; the act of raising awareness.outreign(transitive) To surpass in reigning; to reign through the whole of, or longer than.outremerAn area beyond the sea.outrhyme(transitive) To surpass in rhyming.outriderA guide or escort, especially one who rides in advance.outridesplural of outrideoutrightWholly; completely; entirely.outrival(transitive) To outperform; to outdo.outroper(law, obsolete) An auctioneer.outsailsthird-person singular simple present indicative of outsailoutscent(transitive) To exceed in odour; to be more odorous than.outscold(transitive) To scold more than.outscoop(transitive, colloquial) To report on something, especially something worthy of a news article, before (someone else).outscore(transitive) To score more than.outscorn(transitive) To overcome or overwhelm by haughty disregard; defy; scorn or despise.outscout(transitive) To surpass in scouting, or reconnaissance.outsellsthird-person singular simple present indicative of outselloutsertsplural of outsertoutserve(transitive) To serve more or better than.outshake(transitive) To surpass in shaking; to shake more or better than.outshame(transitive) To be more shameful than.outshape(transitive, poetic, archaic) To give external form to.outshineTo shine brighter than something elseoutshonesimple past and past participle of outshineoutshooksimple past of outshakeoutshoot(sports, US) To score more goals than the other side in a goal sport such as hockey or socceroutshout(transitive) To shout louder or longer than.outshove(transitive) To shove harder or better than; outcompete by shovingoutsiderOne who is not part of a community or organization.outsidesplural of outsideoutsightExpectation; prospect.outsizedOf an unusually large size.outskate(ice hockey, skating, transitive) To skate better than.outskill(transitive) To surpass in skill.outskirtA more remote part of a town or city; the periphery, environs; a suburb.outslang(transitive) To surpass in slang.outsleep(transitive) To sleep longer than or beyond.outsleptsimple past and past participle of outsleepoutslick(transitive) To be more slick than; to exceed in slickness.outslide(poetic) To slide outward, onward, or forward; to advance by sliding.outsling(transitive) To sling more effectively than; to surpass in slinging.outslink(transitive) To surpass in slinking.outslopeA slope that is tilted away from a road.outsmart(transitive) To beat in a competition of wits.outsmell(transitive) To smell more acutely than.outsmile(transitive) To surpass in smiling.outsmoke(transitive) To smoke more than.outsnore(transitive) To snore more or louder than.outsolerOne who fits the outsoles to shoes.outsoundTo surpass in sounding.outspake(archaic) simple past of outspeakoutspeak(intransitive, rare, dialectal) To speak out or aloud.outspeed(transitive) To exceed in speed or velocity; outstrip.outspell(transitive) To spell better than.outspend(transitive) To spend more than some limit or than another entity.outspentsimple past and past participle of outspendoutspokesimple past of outspeakoutspook(transitive, informal) To surpass in spookiness.outsport(transitive) To exceed in sporting; to outdo.outspout(transitive, poetic, archaic) To spout outward.outspurtTo spurt outward.outstand(transitive, archaic) To resist effectually; withstand; sustain without yielding.outstanksimple past of outstinkoutstare(transitive) To stare at (someone) so hard or long that they look away.outstartThe beginning.outstateOf the part of a state of the United States that is away from major metropolitan areas.outsteal(transitive) To surpass in stealing; to steal more than.outsteam(transitive) To travel further or faster by steam power.outsteer(transitive) To steer better than.outsting(transitive) To surpass in stinging; to sting more than.outstink(transitive) To smell worse than; to surpass in stench.outstolesimple past of outstealoutstorm(transitive) To exceed in storming (in various senses).outstripTo move more quickly than (someone or something) so as to outrun or leave it behind.outstrut(transitive) To surpass in strutting.outstudy(transitive) To surpass in studying.outstunt(transitive) To perform more or better stunts than.outsuave(transitive) To exceed in suaveness.outsurge(intransitive) To surge outward.outswarm(transitive) To swarm in greater numbers than.outswear(transitive) To swear (use vulgar or profane language) more frequently or powerfully than.outsweat(ambitransitive, now rare) To sweat out or cause to sweat outoutsweepTo sweep outward.outswell(transitive, obsolete) To exceed in swelling.outswingAn outward swinging motion.outsworesimple past of outswearoutswungswung outwardouttakenpast participle of outtakeouttakesplural of outtakeouttalksthird-person singular simple present indicative of outtalkoutthank(transitive) To surpass in thanking; to give more thanks than.outthink(transitive) To best an opponent by thinking.outthrewsimple past of outthrowoutthrob(transitive) To throb more than.outthrow(transitive) To throw out.outtower(transitive) To rise higher than; to tower above.outtrade(transitive) To trade more or better than.outtrain(transitive) To train more than.outtrick(transitive) To surpass in trickery.outtrump(transitive) To outdo; to get one over on somebody.outvalue(transitive) To have a higher value than; to exceed in worth.outvaunt(transitive) To surpass in vaunting.outvenom(transitive) To exceed in venom.outvoice(transitive) To exceed in noise.outvomit(transitive) To surpass in vomiting; to vomit more than.outvotedsimple past and past participle of outvoteoutvoterOne who casts a vote in an election held in an area in which they do not live.outvotesthird-person singular simple present indicative of outvoteoutwager(transitive) To wager more than.outwaitsthird-person singular simple present indicative of outwaitoutwalksthird-person singular simple present indicative of outwalkoutwardsFrom the interior toward the exterior; in an outward direction.outwaste(ambitransitive) To waste entirely.outwatchTo watch more than someone else.outweary(transitive, archaic) To wear out; to tire.outweave(transitive) To surpass in weaving; to weave more or better than.outweigh(transitive) To exceed in weight or mass.outweird(transitive) To be more weird than; to surpass in strangeness.outwhirl(rare, transitive) To surpass in whirling or spinning.outworksplural of outworkoutworld(science fiction, often attributive) A planet that is remote from the homeworld of a civilization.outworth(transitive, archaic) To exceed in worth.outwrest(rare) To pull out forcibly; to yank out.outwring(poetic, transitive) To wring out.outwrite(transitive) To write more or better than.outwrotesimple past of outwriteoutyield(transitive) To exceed or surpass in yielding.ouvriereAlternative form of ouvrière.ovalenyl(organic chemistry) A univalent radical derived from ovaleneovallikeResembling or characteristic of an oval.ovalling(engineering) distortion into an oval shapeovalnessThe quality of being oval.ovangkolThe dense wood of the African evergreen tree Guibourtia ehie.ovariole(insectology) a tubular component of the insect ovary, a basic unit of egg productionovarious(now rare) Pertaining to or made up of eggs.ovaritis(pathology) inflammation of the ovaryovationsplural of ovationovatoxinAny of a group of toxins, related to the palytoxins, produced by the dinoflagellate Ostreopsis ovata.ovenableSuitable for use in an oven.ovenbirdAny of several birds:ovenette(cooking) A small oven.ovenlessWithout an oven, or without the use of an oven.ovenlikeResembling an oven, especially in shapeovenwareCooking utensils that can be safely used in an oven.ovenwoodwood used to light an ovenoveracidExcessively acid.overactsthird-person singular simple present indicative of overactoveragesplural of overageoveralls(UK) A loose-fitting garment worn over regular clothes to protect them.overarchTo form an arch over something.overawedsimple past and past participle of overaweoverawerOne who overawes.overbake(transitive) To bake too much: for too long, at too high a temperature, or both.overbank(geology) Describing sediments deposited on a floodplain from suspensions in floodwatersoverbear(transitive) To push through by physical weight or strength; to overwhelm, overcome.overbeat(transitive) To beat (eggs, cream, etc.) for too long, impairing the texture.overberg(South Africa) beyond a mountainoverbide(transitive, obsolete) To outlive; survive.overbill(transitive) To bill an excessive amount, particularly an amount greater than one is legally entitled to.overbindTo bind or restrict to an excessive extent.overbite(dentistry) A malocclusion in which the upper teeth extend over the lower ones.overblewsimple past of overblowoverblow(transitive) To cover with blossoms or flowers.overbodesimple past of overbideoverbody(fishing) The upper portion of a jig or lure.overboil(ambitransitive) To boil excessively.overboldToo bold; impertinent or overreaching.overbook(transitive) To sell or guarantee more seats for (an event) than actually exist.overbootA heavy-duty overshoe; a boot that is an overshoe.overbore(firearms) Such that the capacity of the burning cartridge powder is greater than the volume within the barrel.overbossA boss of underbosses in a criminal organization.overbrewTo brew for too long.overbrim(transitive) To flow over the brim of; to overflow.overbrow(poetic, transitive) To hang over like a brow; to impend over.overbulkTo be more bulky than; to tower over.overburn(transitive) To burn too much or for too long.overbust(clothing) Above the bust.overbusyExcessively busy; officious.overcall(poker, bridge) To call a bet after another player has already calledovercamesimple past of overcomeovercard(poker) A card higher than any other card or pair. Often used in reference to the community cards in Texas hold 'emovercare(intransitive) To care too much.overcark(transitive, obsolete) To overcharge; overburden; harass.overcastA cloud covering all of the sky from horizon to horizon.overchew(transitive) To chew too much.overcite(ambitransitive) To cite too much.overcladWearing more clothing than is necessary.overcloy(transitive, dated) To fill beyond satiety.overcoatA heavy garment worn over other clothes, for protection from cold or weather.overcode(countable, research methods) A code used to represent multiple (possibly unrelated) data items.overcoilPart of a watch: an improved balance spring with a raised outer coil.overcoldExcessively cold.overcomb(transitive) To comb too much.overcome(transitive) To surmount (a physical or abstract obstacle); to prevail over, to get the better of.overcone(mathematics) A morphism from a diagonal overfunctor to the base category of the overcategory.overcook(transitive) To cook for too long or at too high a temperature.overcoolExcessively cool; chilly.overcostExcessive cost.overcram(transitive) To cram too full; to overstuff.overcropTo cultivate land excessively and thus exhaust its fertilityovercrow(obsolete, transitive) To take over.overcullTo cull excessively.overcure(transitive) To cure (meat, etc.) excessively.overcuteExcessively or cloyingly cute; saccharine; cutesy.overdampTo damp a system more than would be necessary to prevent oscillationoverdare(intransitive) To dare too much or rashly; to be too daring.overdate(numismatics) A coin on which one date is superimposed over traces of another (due to reuse of a die).overdealTo have too many dealings.overdearToo dear; too highly valued.overdeck(transitive) To overdecorate.overdede(obsolete) Overdoing; excess.overdeepExcessively deep.overdoerSomeone who overdoes something.overdoesthird-person singular simple present indicative of overdooverdogsplural of overdogoverdoneCooked too much.overdoorA decoration, usually a painting, that is placed above a doorway.overdoseAn excessive and dangerous dose of a drug.overdoss(intransitive, UK, slang, trainspotting) To oversleep, thus missing the intended railway stop.overdrawTo withdraw more money from an account than there is credit; to make an overdraftoverdrewsimple past of overdrawoverdrop(transitive) To drop over; to overhang.overdrug(transitive) To drug too heavily.overdust(transitive) To dust with too much powder.overdyedsimple past and past participle of overdyeoverdyesthird-person singular simple present indicative of overdyeovereatsthird-person singular simple present indicative of overeatoveredge(sewing) To overlock.overeditTo edit something too much.overetchTo etch too deeply.overfaceThe upper side or upward-facing surface of an object.overfallA turbulent section of a body of water, caused by strong currents passing over submerged ridges.overfare(transitive) To go over; pass; traverse.overfarm(transitive) To farm too much.overfawn(transitive) To fawn or flatter grossly or excessively.overfear(transitive) To fear excessively; to be too afraid of.overfeed(transitive) To feed a person or animal too much.overfeelTo feel excessively or to too great an extent.overfillTo fill beyond capacity or beyond what is appropriate.overfineExcessively fineoverfireOf a boiler, furnace, or other heating device: relating to components or other things that are located above the fire.overfish(ambitransitive) To fish (an area or a species) excessively, often substantially reducing over several years the supply of one or more species of fish in an area.overflewsimple past of overflyoverflowThe spillage resultant from overflowing.overfluxan overflow; an overflowing or exuberanceoverfold(geology) A fold whereby the strata are forced through an angle of more than 90 degrees, so that younger strata lie below older ones.overfondExcessively fond.overfoul(transitive) To foul excessively.overfreeExcessively free (liberal, familiar, or liberated).overfret(intransitive, reflexive) To fret excessively.overfuck(transitive, vulgar, rare) To fuck excessively.overfullexcessively filled; full to overflowingoverfundTo supply with more funds than necessary or appropriateovergainTo gain too much.overgang(transitive, dialectal or obsolete) To go beyond or above; to exceed.overgavesimple past of overgiveovergaze(poetic) To gaze; to overlook.overgear(automotive) Synonym of overdrive (“a gear higher than the traditional top gear”)overgild(transitive) To cover with gilding.overgiltsimple past and past participle of overgildovergive(ambitransitive) To give too lavishly.overgladExcessively or unduly glad.overglowTo beam or radiate; glow exceedingly or excessivelyovergoerOne who goes over (something); an overcomer, conqueror.overgoodToo good; excessively good.overgownA gown worn over other clothing.overgrewsimple past of overgrowovergripA soft, padded, cloth-like tape wrapped around the grip of a sports racquet to improve the grip.overgrow(intransitive) To grow beyond one's boundaries or containment, or beyond the proper size.overhailTo praise too much.overhairThe long hair overlying the fur of many animals.overhale(transitive) To draw or haul over; overhaul.overhallObsolete form of overhaul.overhandExecuted with the hand brought forward and down from above the shoulders.overhang(transitive) To hang over (something).overhateTo hate excessively.overhaulA major repair, renovation, or revision.overheadLocated above, especially over the head.overheal(intransitive) To heal over.overheap(transitive) To heap too high; heap up excessively; supply too much of.overhear(ambitransitive) To hear something that was not meant for one's ears.overheat(transitive) To heat excessively.overhelpTo supply with too much help.overhend(transitive, obsolete) To overtake.overhent(obsolete) To catch hold of; to overtake.overhighToo high; excessively high.overhire(intransitive) To hire too many employees.overhold(transitive) To overvalue; overestimate; hold or estimate at too dear a rate.overhook(wrestling, martial arts, transitive) To use such a hold upon.overhopeExcessive hope or anticipation; presumption.overhugeExcessively huge.overhungsimple past and past participle of overhangoverhunt(transitive) To hunt (an animal, a piece of land, etc.) too much.overhype(transitive) To promote or publicize excessively.overidleExcessively idle.overjolt(slang) An overdose of heroin or other recreational drug.overjoysthird-person singular simple present indicative of overjoyoverjump(transitive) To jump over.overjustToo zealous in the pursuit of justice.overkeep(transitive) To keep or observe too strictly.overkest(obsolete, poetic) overcastoverkill(literally, military) A destructive capacity that exceeds that needed to destroy an enemy; especially with nuclear weapons.overkindExcessively kind; kind beyond deserts; unnecessarily kind.overkingA king who has sovereignty over inferior kings or ruling princes; a ruler of an overkingdom; a king that is truly superior or supreme; an emperor.overkneeReaching above the knee.overlace(transitive) To spread over in a crossing pattern.overlade(transitive) To load with too great a cargo or other burden; overburden; overload.overlady(rare) A female overlord.overlaidsimple past and past participle of overlayoverlainpast participle of overlieoverland(especially of travel) By or across land.overlapsplural of overlapoverlard(transitive) To cover or coat with lard.overlashTo physically tie additional wires or cables to those that are already attached to a utility pole, accommodating any additional strands of fiber or coaxial cable on existing pole attachmentsoverlateToo late; exceedingly late.overlaud(transitive) To laud excessively; to overpraise.overlaysthird-person singular simple present indicative of overlayoverlead(transitive) To lead excessively or too much.overleafOn the other side of a sheet of paper (including a leaf of a book); thus, on the next page when flipping from a recto to the sequential verso.overlean(transitive) To lean over.overleap(transitive) To leap over, to jump over, to cross by jumping.overlendTo lend too much.overlewdExcessively lewd.overlick(transitive) To lick over.overlierA piece that overlies or overlaps.overliesthird-person singular simple present indicative of overlieoverlime(transitive) To treat (soil) with too much lime.overlineSynonym of overbar.overling(UK dialectal) A ruler; master.overlink(Internet, transitive) To use too many hyperlinks.overlive(transitive) To survive; to live past.overload(transitive) To load excessively.overlock(sewing) A stitch that sews over the edge of one or two pieces of cloth for edging, hemming or seaming.overlongToo long; overly long.overlookA vista or point that gives a view down toward something else.overloopA loop that occurs above something.overlordA ruler of other rulers.overloveTo love too much.overlushExcessively lush.overmake(transitive) To make over or anew; recreate; remake.overmansthird-person singular simple present indicative of overmanovermark(transitive) To place a mark or marking above.overmastTo furnish with a mast or masts overly tall or heavy.overmeekExcessively meek.overmelt(transitive) To melt too much.overmildExcessively mild.overmilk(transitive) To milk (a cow or other animal) too much.overmind(science fiction) The leading or controlling mind in a groupmind.overmine(transitive) To mine excessively.overmist(horticulture, transitive) To mist a plant excessively.overmold(engineering, transitive) To mold (part of an object) over and around another part.overmore(obsolete) beyondovermost(obsolete) The highest (in authority, status, or elevation)overname(obsolete, transitive) To name over or in a series; to recount.overnearToo near; too close.overneatExcessively neat.overnessThe quality of being over (finished, elapsed, concluded).overniceExcessively nice or fastidious.overnighexcessively close or nearovernite(US) Informal spelling of overnight.overpack(intransitive) To pack too much.overpageOver the page; on the next page of the document.overpaidsimple past and past participle of overpayoverpair(poker) A pocket pair of a higher rank than the community cards on the board.overpark(intransitive) To park (a vehicle) for longer than is permitted.overpassA section of a road or path that crosses over an obstacle, especially another road, railway, etc.overpast(archaic) ended; having passed over or passed byoverpeel(transitive) To peel too much off.overpeerTo peer over; to overlook.overpertExcessively pert.overpile(transitive) To pile too high.overplan(transitive) To plan in too much detail.overplay(ambitransitive, acting) To overdo or overact one's effect or role.overplot(transitive) To plot (data) on top of a previous plot.overplowAlternative spelling of overplough.overplusThat which remains beyond what is necessary or required; a surplus.overpole(transitive, metallurgy) To pole excessively.overpostTo post too much or too often.overpourTo pour an excessive amount.overpull(engineering) The driver for a pump that has the eccentrics above or beside the gear wheel.overpumpTo pump excessively.overpushA push of the upper part of an object, thereby generating a shearing or turning forceoverrace(transitive) To race too often.overrack(archaic, transitive) To torture beyond bearing.overrake(transitive) To rake over, or sweep across, from end to end, as waves break over a vessel anchored with its head to the sea.overrangsimple past of overringoverrankToo rank or luxuriant.overrashExcessively rash.overrateTo esteem too highly; to give greater praise than due.overreadTo read too much or excessively.overrelyTo rely too much (on something or someone); to be overly dependent (on) or expectant (about).overrent(transitive) To rent for too much.overrichExcessively rich.override(transitive) To ride across or beyond something.overrifeExcessively rife.overringA ring diacritic positioned above a character, as in Å.overripeExcessively ripe; spoiled; gone bad.overrise(of dough, ambitransitive) To rise excessively.overrobeA robe designed to be worn over other clothing, particularly another robe.overrodesimple past of overrideoverroofA roof constructed above another roof.overrosesimple past of overriseoverrude(rare) Too rude; more rude than necessary or desirable.overruff(bridge) To ruff with a higher trump following a prior ruff on the same trick.overrule(transitive) To rule over; to govern or determine by superior authority.overrunsthird-person singular simple present indicative of overrunoversail(transitive, architecture) To project from a structure above (something); to overhang.oversaleThe sale of more of something than can be supplied.oversalt(cooking) To add too much salt to (something)oversand(transitive) To sand excessively.oversangsimple past of oversingoversave(intransitive) To save more money than is necessary or prudent.overscan(television) The additional area around the four edges of a video image, outside of the safe area, that is not normally seen by the viewer.overseal(transitive) To close with a seal at the top.overseamA seam in which the thread is at each stitch passed over the edges sewn together.overseasAbroad, especially across the sea.overseedTo replenish (a pasture, lawn, or field) by adding more seeds over top of the existing vegetation (as opposed to tilling and replanting the land).overseenpast participle of overseeoverseerOne who oversees or supervises.overseesthird-person singular simple present indicative of overseeoversell(transitive) To agree to sell more of something than one can supply.oversendTo send an amount greater than what is required; to oversupply.oversetsthird-person singular simple present indicative of oversetoversewnpast participle of oversewovershoeA shoe worn over an ordinary shoe, as:overshop(intransitive) To spend too much time or money shopping.overshotsimple past and past participle of overshootovershow(transitive) to show excessively or too muchoversick(rare) Excessively unwell.oversideLocated or positioned over the side, especially of a ship.oversingTo sing with too much effort or embellishment.oversite(construction) Laid over the ground, or built above an existing site.oversizeLarger than normal.overskim(transitive) To skim excessively; to remove too much material from, by skimming.overskipTo skip or leap overoverslay(architecture, obsolete) A lintel.overslip(transitive) To slip or slide over; to pass easily or carelessly beyond.overslop(obsolete) An outer garment or slop.oversmanAn overseer or superintendent.oversmenplural of oversmanoversnowTravelling over a snowy surface.oversoak(transitive) To soak for too long.oversoarTo soar over or aboveoversoftToo soft; too quiet.oversold(finance) In a stock or commodity market condition where there has been significant trading driving prices down to lower levels, levels which seem overextended or excessive on a short-term basis.oversoonToo soon; prematurely.oversoul(philosophy, especially in transcendentalism) A supreme reality or mind; the spiritual unity of all being.oversourOverly or excessively sour; too sour.overspan(transitive) To reach or extend over.overspinAn excessive amount of spin applied to a projectile such that its nose does not turn down at the summit of the trajectory.overspun(textiles) Too tightly spun.overstay(intransitive) To remain present after the agreed or appropriate departure time.overstep(transitive) To go too far beyond (a limit); especially, to cross boundaries or exceed norms or conventions.overstimoverstimulationoverstir(transitive) To stir too much.overstow(usually of cargo) To stow on top of one another.oversuds(transitive) To cause (a washing machine) to fill with too much suds.oversuitA garment worn over set of clothing or another suitoversureExcessively sure.overswamsimple past of overswimoverswim(transitive) To swim too fast or too strenuously.overtakeTo pass a slower moving object or entity (on the side closest to oncoming traffic).overtalk(intransitive) To talk too much.overtameExcessively tame.overtartExcessively tart.overtask(transitive) To task too heavily; to give someone or something too many tasks; to overburden.overtautExcessively taut.overteem(intransitive) To be filled or swarming with something.overtell(transitive) To exaggerate or be more explicit than needed; tell too much or too often, etc.overtempA condition in which a device or machine has reached a temperature above that approved by the manufacturer.overtestTo subject to excessive testingoverthin(transitive) To make too thin.overtill(ambitransitive, agriculture) To till too much.overtilt(transitive) To tip over; to upset.overtime(uncountable) Working time outside of one's regular hours.overtint(transitive) To tint excessively.overtire(transitive) To tire excessively.overtoil(transitive) To weary (someone or something) excessively; to exhaust or tire out by working too much.overtone(physics, music) A tone whose frequency is an integer multiple of another; a member of the harmonic series.overtooksimple past of overtakeovertoutTo tout to excessovertrapTo put too many traps in (an area) or among (an animal population), and thus to trap too many (animals, for their population to recover).overtrim(transitive) To trim too much.overtripTo stumble and fall overovertrodsimple past of overtreadovertube(surgery) A protective tube used during endoscopy, typically during removal of a foreign bodyoverture(often in plural) An approach or proposal made to initiate communication, establish a relationship etc.overturn(ambitransitive) To turn over, capsize or upset.overtypeTo type on top of something already typed.overurge(transitive) To urge excessively.overusedUsed too much, or too often.overuserOne who overuses.overusesthird-person singular simple present indicative of overuseovervast(rare) Overly vast.overveil(transitive) To veil or cover.overviewA brief summary, as of a book or a presentation.overvolt(transitive) To increase the voltage used in a component.overvote(US politics) A case in which a voter has marked a ballot for more choices than allowed by the rulesoverwait(transitive) To wait for an excessive amount of time; wait beyond the time allowed or expected; wait too long.overwalkAn elevated walkway that provides passage above the main area of a facility; a catwalk.overwarmExcessively warm.overwarnTo warn excessively.overwaryToo wary; excessively cautious.overwash(transitive) To wash too much or too often.overweakExcessively weak; too feeble.overwear(transitive) To wear out; to exhaust.overween(ergative) To think too highly or arrogantly of (oneself).overwentsimple past of overgooverwhip(transitive) To whip (cream, etc.) too much, so as to spoil the texture.overwideExcessively wide.overwildExcessively wild.overwilyExcessively wily.overwind(transitive) To wind (tighten a spring of) something excessively.overwingOver the wing of an aircraft.overwipe(transitive) To wipe too much.overwire(transitive) To wire more, or to a greater level, than is necessary.overwiseExcessively wise; too clever for one's own good.overwokeoverzealous in the use of the word wokeoverword(UK, dialectal) Any word or phrase frequently repeated.overworesimple past of overwearoverwork(transitive) To make (someone or something) work too hard.overwrapA secondary wrapper covering an item.overyear(UK, dialect) Kept over from the previous year.overzealExcessive zeal.ovicidalHaving the ability to kill an ovumovicidesplural of ovicideovicular(biology, archaic) Of, resembling, or pertaining to an egg.oviducal(anatomy) Of or pertaining to oviducts.oviductsplural of oviductovigenicSynonym of oogenetic.ovinisedAlternative form of ovinized.ovinized(genetics) Modified by the addition of ovine genesoviposit(intransitive, zoology or paraphilia) To lay eggs.oviscape(entomology) The oviscapte or ovipositor.oviscaptAlternative form of oviscapte.ovistripA form of ovitrap.ovogenicRelating to ovogenesisovomancySynonym of oomancy.ovomucinA trypsin inhibitor found in raw egg white, responsible for its gel properties.ovopathydisease of the ovumovophileA mouthbrooding member of the fish family Cichlidae.ovorubin(biochemistry) A chromoprotein, present in gastropod eggs, that is a proteinase inhibitor.ovothiol(organic chemistry) Any of a group of antioxidant mercaptohistidines found in the eggs of some marine invertebratesovotoxicToxic to the ovum.ovotoxinA toxin found in eggs.ovulatedsimple past and past participle of ovulateovulatorAn animal that ovulates (typically, in a specified manner)owednessThe state or quality of being owed.owensite(mineralogy) An isometric-hexoctahedral black mineral containing barium, copper, iron, lead, nickel, and sulfur.owleriesplural of owleryowlinessThe condition of being an owl or having owllike characteristics.owlishlyIn an owlish manner, especially with regard to looking.owneress(rare, dated) A female owner.oxacycle(organic chemistry) A heterocyclic compound with oxygen in the ring.oxadixylA particular fungicide.oxalatesplural of oxalateoxalemia(pathology) The presence of oxalate in the bloodoxalinicOf or pertaining to oxalinic acid or its derivativesoxalisesplural of oxalisoxalosisThe deposition of oxalate within the body.oxaluria(physiology, medicine) The presence of oxalic acid and oxalate in the urine (which is often true, in some amount or other).oxammite(mineralogy) An orthorhombic-disphenoidal mineral containing carbon, hydrogen, nitrogen, and oxygen.oxanilic(organic chemistry) Of or pertaining to oxanilic acid or its derivativesoxathiin(organic chemistry) A six-membered, unsaturated heterocycle containing four carbon atoms, one sulfur and one oxygen atom and two double bonds, but especially 1,4-oxathiinoxazepam(pharmacology) A drug of the benzodiazepine group, used to treat anxiety states and insomnia; 7-chloro-1,3-dihydro-3-hydroxy-5-phenyl-1,4-benzodiazepin-2-one, C₁₅H₁₁ClN₂O₂.oxazolam(pharmacology) A benzodiazepine drug with anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties.oxazolesplural of oxazoleoxazolyl(organic chemistry, especially in combination) A radical derived from an oxazoleoxdriverA person who drives or guides an ox or a yoke of oxenoxeladinA particular kind of cough suppressant.oxengate(historical) Synonym of oxgang.oxenkind(rare) All oxen and their close relatives, considered as a group.oxepinac(pharmacology) A nonsteroidal anti-inflammatory drug.oxetanyl(organic chemistry, especially in combination) A univalent radical derived from oxetaneoxheartsplural of oxheartoxidable(chemistry) Capable of being oxidized.oxidantsplural of oxidantoxidasesplural of oxidaseoxidasicOf or relating to oxidase.oxidatedsimple past and past participle of oxidateoxidator(obsolete) An oxidizer.oxidisedsimple past and past participle of oxidiseoxidiserNon-Oxford British English standard spelling of oxidizer.oxidisesthird-person singular simple present indicative of oxidiseoxidizedsimple past and past participle of oxidizeoxidizer(chemistry) An oxidizing agent, especially one used to oxidize the fuel of a rocket or a fuel cell.oxidizesthird-person singular simple present indicative of oxidizeoximatedConverted to an oximeoximeter(chemistry) A device that measures the quantity of oxygen in something, particularly air in the atmosphere.oximetre(nonstandard, uncommon) Alternative form of oximeter.oximetryThe measurement of the oxygen level in arterial bloodoximonamA beta-lactam antibiotic.oxindole(uncountable, organic chemistry) A bicyclic aromatic heterocycle containing a benzene ring fused with five-membered cyclic amideoxoalkyl(organic chemistry, especially in combination) Any alkyl group in which a methylene group has been replaced by a carbonyl group.oxoamide(organic chemistry) Any amide of a ketocarboxylic acidoxoanion(chemistry) Any anion derived from an oxoacidoxoethyl(organic chemistry, especially in combination) Any radical formed by substitution of an oxygen atom (as a carbonyl group) for two hydrogen atoms of an ethyl radicaloxpeckerEither of two species of passerine bird in the genus Buphagus, endemic to the sub-Saharan African savanna.oxtongueBeef tongue (a foodstuff).oxyaenid(zoology) Any mammal in the family Oxyaenidae.oxyallyl(organic chemistry) The diradical, CH₂=C(-O⁻)-C⁺₂.oxyanion(chemistry) Any anion derived from an oxyacidoxyarene(organic chemistry) Any arene that has a benzyloxy (or similar) protecting groupoxyclineA sharp gradient on oxygen concentrationoxyconic(malacology, of a shell or fossil) Having a flattened crossection, the halves joining at an acute angle.oxycrate(medicine, archaic) A mixture of water and vinegar.oxydasesplural of oxydaseoxyester(organic chemistry) An ester of an oxyacidoxygenicof, relating to, containing or producing oxygenoxygraphA form of respirometer.oxyhaemeAlternative form of oxyheme.oxyimino(organic chemistry, especially in combination) A divalent radical of the form R-O-N=oxyjoule(physiology, rare) The number of joules of heat energy produced per unit of oxygen consumption.oxylanceSynonym of oxygen lance.oxylipid(organic chemistry) Any lipid derived from an oxylipin rather than a normal fatty acidoxylipin(biochemistry) oxygenated natural products which are formed from fatty acids by pathways involving at least one step of dioxygen-dependent oxidation; many of them have physiological importanceoxymeter(dated, now nonstandard) Alternative spelling of oximeter.oxymetryAlternative form of oximetry.oxymonadAny of a group of flagellated protozoa found exclusively in the intestines of termites and other wood-eating insects.oxymoron(rhetoric) A figure of speech in which two words or phrases with opposing meanings are used together intentionally for effect.oxynotid(zoology) Any shark in the family Oxynotidae.oxyosmiaAbnormal acuity or strength of the sense of smelloxysteelSteel produced by reduction of iron oxides by carbon.oxytalanA fibrous component of the extracellular matrix of teethoxytaxis(biology) movement or orientation towards a supply of oxygenoxytocia(medicine) An unusually rapid childbirth.oxytocic(medicine) Serving to promote uterine contractions, thus accelerating childbirth.oxytocin(biochemistry) A hormone that stimulates contractions during labor, and then the production of milk; also plays a role in social bonding.oxytonesplural of oxytoneoxytonic(prosody) Having a stress on the last syllable.oxytrope(botany) Synonym of locoweed.oyakodonA Japanese dish of chicken, egg, sliced scallion, etc. simmered in soup and served on top of rice.oyntmentObsolete form of ointment.oysteredsimple past and past participle of oysteroystererOne who finds and sells oysters.ozaenineAny ground beetle of the tribe OzaeniniozanimodA drug for the treatment of ulcerative colitis.ozarkite(mineralogy) Thomsonite, a mineral series of the zeolite group.ozenbrigA tough, coarse linen woven in Osnabrück, Westphalia.ozmazomeAlternative form of osmazome.ozobrome(photography, historical) A form of carbro print.ozokeritArchaic form of ozocerite.ozonatorA device that produces a supply of ozone by passing a silent electrical discharge through oxygenozonisedsimple past and past participle of ozoniseozoniserAlternative form of ozonizer.ozonizedsimple past and past participle of ozonizeozonizerA device that converts oxygen into ozone, normally by means of a silent electrical discharge; an ozone generator.ozonizesthird-person singular simple present indicative of ozonizeozophore(zoology) An elevated cone present on the prosoma of some harvestmanozraptorAn Australian dinosaur of the genus Ozraptor
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