Browse Other O Word Lengths
7-Letter O Words by Ending Letter
All 1,254 7-Letter Words Starting With O
oakbarkThe bark of the oak tree, often specifically as a source of tannic acid; tan.oakgallAlternative spelling of oak gall.oakiestsuperlative form of oaky: most oakyoakleaf(often attributive) The leaf of the oak.oaklikeResembling or characteristic of an oak or its wood.oaklingA small or young oak tree.oakmossEvernia prunastri, a lichen found primarily on oak trees and used in perfume.oaknessThe quality of being oak, or of being an oak tree.oaktree(less common) Alternative form of oak tree.oakwareArticles made from oak.oakwood(countable) A wood populated with oak trees.oarfishA large, greatly elongated, type of fish of the family Regalecidae.oarhole(nautical) a slot or opening in the side of a galley or ship through which an oar is fittedoaritisArchaic form of ovaritis.oarlikeResembling or characteristic of an oar.oarlock(nautical) A usually U-shaped device attached to the gunwale of a rowboat to hold the oars in place while rowing.oarsmanA person who rows a boat, either alone or with others.oarsmenplural of oarsmanoarweedA brown alga, Laminaria digitata, found on exposed shores.oasiticOf or relating to an oasis.oatcakeAny of many flat biscuits, or cakes, made from oatmeal.oathfulInclined to swear oaths, or curse.oathlet(nonce word) A pledge or promise that does not carry the full level of commitment of an oath.oatiestsuperlative form of oaty: most oatyoatlage(agriculture) Silage made from oats: oat silage.oatlikeResembling an oat or oats.oatmealMeal made from rolled or round oats.oatmilkAlternative spelling of oat milk.obaship(Nigeria) The role or status of an oba.obconic(botany) of a fruit, conical in shape and attached to the stalk by the pointed end.obeliac(anatomy) Relating to, pertaining to, or situated near, the obelion.obeliasplural of obeliaobelion(anatomy) A craniometric point on the sagittal suture between the parietal foramina near the lambdoid suture.obeliscArchaic spelling of obelisk.obeliseAlternative spelling of obelize.obelisk(architecture) A tall, square, tapered, stone monolith topped with a pyramidal point, frequently used as a monument.obelism(rare) The practice of annotating manuscripts with marks set in the margins.obelizeTo mark (a written or printed passage) with an obelus; to judge as spurious or doubtful.obentosplural of obentoobeselyIn an obese manner.obesideA particular steroid glycoside.obesifyTo become or to make obeseobesity(pathology) The state of being obese.obeyeth(archaic) third-person singular present simple form of obeyobeyingpresent participle and gerund of obeyobijimeA thin rope attached to an obi.obitualOf or relating to obits.objectsplural of objectoblastsplural of oblastoblatesplural of oblateoblatum(geometry) An oblate spheroid; a figure described by the revolution of an ellipse about its minor axis.obleege(archaic, nonstandard) To oblige.obligedUnder an obligation to do something.obligee(law, finance) The party owed an obligation by another party, the obligor.obligerOne who, or that which, obliges.obligesthird-person singular simple present indicative of obligeobligor(law, finance) The party bearing a legal obligation to another party (the obligee).obliqueNot erect or perpendicular; not parallel to, or at right angles from, the base.oblongsplural of oblongobloquyAbusive language.obnosis(Scientology) Observing the obvious.oboeistAlternative spelling of oboist.obolary(nonce word) Possessing only small coins; impoverished.obolizeArchaic form of obelize.obovate(botany, mycology) Shaped like an egg, with the broad extremity located away from the base.obovoidApproximately obovate in shape.obround(geometry) A plane shape consisting of two semicircles connected by parallel lines tangent to their endpoints.obsceneOffensive to standards of decency or morality.obscureDark, faint or indistinct.obsequyThe last office for the dead.obserueObsolete spelling of observe.observe(transitive) To notice or view, especially carefully or with attention to detail.obtainsthird-person singular simple present indicative of obtainobtrude(transitive) To proffer (something) by force; to impose (something) on someone or into some area.obtusercomparative form of obtuse: more obtuseobtusin(organic chemistry) A bromine-containing polycyclic ketal found in the marine alga Laurencia obtusa.obumber(dated, obsolete) To overshadow or to obscure.obverseTurned or facing toward the observer.obviate(transitive) To avoid (a future problem or difficult situation).obviousEasily discovered, seen, or understood; self-explanatory.obvolve(obsolete, transitive, botany) To enfold or wrap around; to cover by wrapping.obzocky(eastern Caribbean English, of a person or thing) Awkward; unattractive; out of place; lopsided; misshapen.ocarina(music) A woodwind musical instrument that is closed at both sides to produce an enclosed space, and punctured with finger holes.occabot(archaic, costermongers) Tobacco.occiferAlternative spelling of ossifer.occiput(chiefly anatomy) The back part of the head or skull.occlude(transitive) To obstruct, cover, or otherwise block (an opening, a portion of an image, etc.).occluse(obsolete) shut; closedoccularMisspelling of ocular.occuredMisspelling of occurred.occurreObsolete form of occur.occurse(obsolete) Synonym of occursion (“joining or striking together”).oceanicOf or relating to the ocean.ocellarof or relating to the ocellus or ocelliocellusA simple eye consisting of a single lens and a small number of sensory cells.oceloid(zoology, archaic) Resembling the ocelot.ocelotsplural of ocelotochdamh(Scotland, historical) An obsolete Scots unit equal to ¹⁄₈ daugh, notionally comprising 50 Scottish acres.ochreaeplural of ochreaochrept(soil science) A particular type of inceptisol.ochrishHaving an ochre-like color.ochroidResembling or containing ochre.ochrousContaining ochre.ocimene(organic chemistry) Any of several isomeric monoterpenes found in many plantsocivityAlternative form of oisivity.ockerer(obsolete, Scotland, especially law) A usurer.ocreateWearing boots, leggings, or ochreae (greaves).octadicof or pertaining to an octad; eightfoldoctagon(geometry, also attributively) A polygon with eight sides and eight angles.octamerAn oligomer having eight subunits.octanal(organic chemistry) The saturated aliphatic aldehyde having eight carbon atoms.octanesplural of octaneoctanol(organic chemistry) Any of many isomers of the saturated aliphatic alcohol having eight carbon atoms, but especially the simple primary alcohol n-octanol; its esters are used in perfumeryoctantsplural of octantoctaose(biochemistry) Any oligosaccharide containing eight monosaccharide moietiesoctaoxo(chemistry, in combination) A chemical compound with eight oxygen atoms with double bonds.octaplaA text presented in eight parallel versions, especially (historical) the version of the Bible presented in such a fashion by Origen.octapusMisspelling of octopus.octaqua(chemistry, in combination) Eight water molecules in a compound.octarch(botany) Having eight strands of xylemoctaval(music) Of, pertaining to, or relating to an octave.octavedHaving a specified kind or number of octaves.octavesplural of octaveoctavic(mathematics) Synonym of octic.octavin(music) A single-reed instrument with a conical bore, originating in Germany.octenal(organic chemistry) Any of several isomeric unsaturated aliphatic aldehydes having eight carbon atoms and one double bondoctenol1-octen-3-ol, a chemical in human breath and sweat that attracts biting insects such as mosquitoes.octenyl(organic chemistry, especially in combination) Any of several isomeric radicals derived from an octeneoctetteRare spelling of octet.octitol(biochemistry) Any sugar alcohol having eight carbon atomsoctoate(organic chemistry) octanoateoctofid(botany) Cleft or separated into eight segments.octogenThe explosive HMXoctogonObsolete form of octagon.octomerAlternative form of octamer.octopal(uncommon) Octopuslike.octopicOf, pertaining to, or resembling an octopus; octopuslike.octopodAny animal with eight feet or foot-like parts.octopus(countable, strictly) A mollusc from genus Octopus.octovir(historical, Ancient Rome) Any member of a group of eight officials.octroisplural of octroioctuplyIn an eightfold manneroctylic(chemistry) Pertaining to, derived from, or containing octyl.ocularyOf or pertaining to the eye.oculate(zoology) Having eyes, or large or well-developed eyes.oculismophthalmology; optometryoculistAn eye doctor; an ophthalmologist or optometrist.ocupado(US, humorous) Occupied (said of a toilet stall).odacineAny fish of the genus OdaxodaliskAlternative spelling of odalisque.odalism(historical) A system of heritable freehold property rights to odal land.odallerAlternative form of udaller.odalman(historical) A man having odal, or able to share in it by inheritance.oddballAn eccentric or unusual person.odderon(physics) The hypothetical counterpart of the pomeron, carrying odd charge parity.oddlingOne who is odd or eccentric; an oddball.oddmentA part of something that is left over, such as a piece of cloth.oddness(uncountable) The state or quality of being odd.oddsmanA person who offers odds to gamblers.oddsomeMarked by oddness; strangeodiniid(zoology) Any fly of the family Odiniidae.odinite(mineralogy) A monoclinic-domatic mineral containing aluminum, hydrogen, iron, magnesium, manganese, oxygen, silicon, and titanium.odology(rare) The study of roads or paths.odonateAny carnivorous insect of the order Odonata; a dragonfly or damselfly.odonymyThe study of street names.odorantAny substance that has a distinctive smell, especially one added to something (such as household gas) for safety purposesodorate(obsolete) odorousodoriseNon-Oxford British English standard spelling of odorize.odorize(transitive) To add an odorant to (especially a gas, so that leaks can be more easily detected).odoromeAll the odorant compounds in an organismodorousHaving a distinctive odor.odotopeA compound whose shape is responsible for its odourodotopyThe mapping of odorants to specific parts of the brain where they are detected and recognizedodouredAlternative form of odored.odylism(pseudoscience, historical) A belief in a vital force known as od or odyle.odylistA believer in odylism.odyllicAlternative form of odylic.odysseyAn extended adventurous voyage, usually in search of home.oeconymUncommon spelling of oikonym.oedemicOf or pertaining to oedemasoedipalAlternative letter-case form of Oedipal.oegipanAlternative form of aegipan.oenomelA beverage made of wine and honey.oerstedThe CGS unit of magnetizing field (symbol Oe), defined as 1000/4π (≈79.5774715) amperes per meter of flux path.oestrid(zoology) Any member of the family Oestridae, the botflies.oestrin(biochemistry, now rare) An oestrogen, specifically oestrone.oestrum(figurative, now rare) Something that stings or incites one to frenzy or action; an impulse or passion.oestrus(countable) A biting fly of the genus Oestrus; a botfly.oeuvresplural of oeuvreoffallyContaining or consisting of offal.offbaseAlternative form of off base.offbear(masonry, brickmaking) To carry off from the moulding-table and place on the ground to dry.offbeat(music) The beats not normally accented in a measure.offcast(transitive) To cast off; shed.offcomeThat which comes off or the act or process of coming off; emission.offcutsplural of offcutoffdutyAlternative form of off duty.offenceBritish, Australia, New Zealand, and Canada standard spelling of offense.offendsthird-person singular simple present indicative of offendoffenseThe act of offending.offeredsimple past and past participle of offeroffereeOne to whom an offer is made.offererOne who offers.offerorOne who makes an offer to another; someone who presents something to another for acceptance or rejection.offhandWithout planning or thinking ahead.offheldsimple past of offholdoffhold(transitive, archaic) To retain.officalMisspelling of official.officerOne who has a position of authority in a hierarchical organization, especially in military, police or government organizations.officesplural of officeofficey(informal) Officelike; resembling or pertaining to an office.offlead(transitive) To lead off or away.offline(by extension) Happening in the physical world (the real world) as opposed to on the internet.offlist(Internet) Not on a mailing list or newsgroup.offload(transitive) To unload.offnessThe quality of being off (in various senses).offpeakAlternative form of off-peak.offrampAlternative form of off-ramp.offroadAlternative form of off-road.offsetsplural of offsetoffside(sports) In an illegal position ahead of the ball, puck, etc.offsiteAway from a main location; in a place not owned by a particular organisation.offskipObsolete form of offscape.offslipAlternative form of off-slip.offspinAlternative form of off spin.offsuit(card games, chiefly poker) Of two or more cards, not of the same suit.offtake(transitive) To take off; take away, remove.offtimeAlternative form of off time.offwingOccurring with the engines removed from the aircraft.oficinaA nitrate-producing factory in a Spanish-speaking country.ofrendaA shrine of offerings to one's ancestors set up on the Day of the Dead.oftenercomparative form of often: more oftenoftenly(nonstandard) oftenoftimes(chiefly US, uncommon) (elsewhere, archaic) Alternative form of ofttimes.oftness(archaic, rare) The quality of happening often; frequency.ofttime(archaic) oftenoftusedAlternative spelling of oft-used.ofuraceA particular fungicide.ogbanjeIn Igbo folklore, an evil spirit that is born into a family to bring them misfortune.ogdoadsplural of ogdoadoghamicIn, of, or pertaining to Ogham.ogogoroA strong alcoholic drink of West Africa, distilled from the juice of raffia palm trees.ogonoriAn edible seaweed (Gracilaria spp.).ogreishResembling an ogre; cruel and wicked.ogreism(archaic) The character or manners of an ogre.ogtiern(Scotland, historical) The person who is fourth in the line of descent from a thane.ohanglaA genre of music and dance among the Luo people, having sexually suggestive themes.ohmygodEye dialect spelling of oh my God.ohnologAlternative form of ohnologue.oidioidOf or relating to the fungus genus Oidium.oikball(derogatory, informal, chiefly Oxbridge and rugby) Association football.oikonymA type of toponym denoting a settlement or its part.oilableAble to be oiled.oilbeanAn African tree, Pentaclethra macrophylla.oilberg(informal) A supertanker that transports oil.oilbirdA nocturnal South American bird, of the species Steatornis caripensis of the order Steatornithiformes, related to the nightjars that feeds on the fruit of the oil palm and tropical laurels.oilcakeAlternative spelling of oil cake.oilcansplural of oilcanoilcoatAn oilskin coat.oilcropAny plant or plant product harvested for oil.oildown(car racing) An oil spill sufficiently serious as to require the use of mechanical equipment to clean it up.oilfishA snake mackerel (Ruvettus pretiosus), having a high content of wax esters instead of glyceride oils.oiliestsuperlative form of oily: most oilyoillessLacking, or not using, oil.oillikeResembling or characteristic of oil.oilpalmAlternative form of oil palm.oilrigsplural of oilrigoilsandAlternative spelling of oil sand.oilseedThe seed of any of several plants which are used commercially as a source of vegetable oil.oilskinCloth made from cotton and treated with oil and pigment to make it waterproof.oilspotAlternative form of oil spot.oilwellAlternative form of oil well.oilyishSomewhat oily.oinkingpresent participle and gerund of oinkoinomelAlternative form of oenomel.ointingpresent participle and gerund of ointokadaicOf or pertaining to okadaic acid or its derivativesokapana(Namibia) Alternative form of kapana (“barbecued meat etc.”).okayish(informal) Somewhat okay; tolerable.okenite(mineralogy) A silicate mineral associated with zeolites, having the chemical formula (CaSi₂O₅·2H₂O).okenone(organic chemistry) A particular carotenoid.okimonoA Japanese ornament or decorative object.okwukwuAn Igbo funeral ceremony.olachenAlternative form of eulachon.olaflurA fluoride-containing substance used in dental treatment.olamineethanolamineolation(inorganic chemistry) The process by which metal ions form polymeric oxides in aqueous solution.oldhead(African-American Vernacular) An older person, especially one who acts as a leader or mentor.oldhoodThe state or condition of being old; the stage of life where one is advanced in age; old ageoldline(religion) Of or relating to the older mainline churches of the United States.oldlingOne who is old or advanced in years; elder.oldnessThe state of being old; age.oldshit(4chan /lgbt/ slang, sometimes derogatory) A transgender person who began transitioning at a relatively late age (after puberty is fully complete).oldster(informal, sometimes disrespectful) Someone who is old.oldtown(nonstandard, very rare) Alternative form of old town.oldwifeAlternative form of old wife (“various types of fish”).oleamen(medicine, obsolete) A soft ointment prepared from oil.olearia(botany) Any of the genus Olearia of flowering plants in the family Asteraceae.oleatesplural of oleateolefine(chemistry) olefiant gas, or ethyleneolefinsplural of olefinoleicum(obsolete, organic chemistry) oleic acid, (an organic acid prepared from fatals, appearing as a yellowish liquid), used to form oleatesolenite(mineralogy) A trigonal-ditrigonal pyramidal light pink mineral containing aluminum, boron, hydrogen, oxygen, silicon, and sodium.oleogelA thixotropic gel, composed of silica in linseed oil, used in oil paintingoleosinA kind of structural protein found in vascular plant oil bodies and in plant cells.olestraA fat substitute (a glyceride of sucrose) that cannot be easily digested and therefore adds no fat, calories, or cholesterol to food products; also used as an industrial lubricant.olfactyA unit for measuring intensity of smell.olibeneAn essential oil, principally a mixture of diterpenes, obtained by the distillation of olibanum.oliebolA traditional Dutch and Belgian delicacy, a pastry similar to a donut.olifant(historical) An ancient hunting horn, made of ivory.oligist(mineralogy, dated) HematiteoligoidSynonym of oligomeric.olingosplural of olingoolitiauA gigantic cryptid of Central Africa, said to resemble a bat or flying reptile.olitory(obsolete) Of or pertaining to a kitchen garden; used for culinary purposes.olivaryShaped like an oliveoliversplural of oliverolivetsplural of olivetolivileAlternative form of olivil (“organic compound”).olivine(mineralogy, geology) Any of a group of olive green magnesium-iron silicate minerals that crystallize in the orthorhombic system.oliviteA tough rubber compound that becomes very slippery when wet.ollamhsplural of ollamhologiesplural of ologyologist(colloquial) One who studies some branch of learning, especially one ending in -ology; a specialist.olorosoA type of sherry, darker and smoother than fino sherry, used as a base for sweetened sherries.oloteraA traditional Mexican tool consisting of bound, shortened corncobs, against which ears of corn are scraped against to remove their kernels.olycookAlternative form of olykoek.olykoek(US, Hudson Valley New York dialect) A doughnut.omakase(chiefly Japanese cuisine) Chef's choice.omalgia(medicine) pain in the shoulderomalous(mathematics) Satisfying an analog of the anomaly cancellation condition.omanderThe wood of Diospyros ebenum (syn. Diospyros ebenaster), a kind of ebony found in Ceylon.omegath(set theory, rare) In the position known as omega (a transfinite ordinal number referring to the next position after ordering a countably infinite set).omegoidHaving the form of the Greek capital letter omega, Ω.omeiite(mineralogy) An orthorhombic-dipyramidal steel gray mineral containing arsenic, osmium, and ruthenium.omeletsplural of omeletomeningpresent participle and gerund of omenomental(anatomy) Of or pertaining to an omentum or the omenta.omentin(biochemistry) Any of a family of secretory proteins expressed predominantly in visceral adipose tissue.omentum(anatomy) Either of two folds of the peritoneum that support the viscera.omicron(virology, pathology) Ellipsis of Omicron variant.omikronAlternative form of omicron.omikujiA random fortune, often written on a strip of paper or on a stick of bamboo, available at Japanese shrines in exchange for a small offering.ominate(transitive, obsolete) To be an omen for (something); to foreshow, to presage.ominousOf or pertaining to an omen or to omens; being or exhibiting an omen; significant.omittedsimple past and past participle of omitomitterSomeone who omits.omiyage(countable) A souvenir, often candy or any another edible item, purchased for coworkers in Japanese culture.omletteMisspelling of omelette.ommatid(zoology) Any beetle in the family Ommatidae.ommatinA simple ommochromeommitedMisspelling of omitted.omneity(obsolete) The fact or condition of being all, specifically as an attribute of God.omniana(dated) A work containing information on every topic.omnibox(Internet, graphical user interface) An enhanced address bar in a web browser that can also accept certain text commands.omnibusAn anthology of previously released material linked together by theme or author, especially in book form.omnietyThat which is all-pervading or all-comprehensive; hence, God.omnificCapable of making or doing anything; all-creating.omnitig(genetics) A particular assemblage of contigs.omniumsplural of omniumomomyid(zoology) Any member of the family †Omomyidae, a diverse group of extinct primates.omphaliplural of omphalusomuriceA Japanese dish consisting of an egg omelette with rice mixed with ketchup in the center.onagersplural of onageronagrad(botany) Any plant of the family OnagraceaeonaholeAn artificial vagina for use in masturbation.onanismMasturbation.onanistA person, especially a man, who masturbates.onboardCarried or used on or in a vehicle or vessel.oncaeid(zoology) Any copepod in the family Oncaeidae.oncillaA small spotted felid, of species Leopardus tigrinus, found in the tropical rainforests of Central America and South America.oncogenAny agent that causes tumors.oncomerAn oncoming vehicle.oncomir(genetics, medicine) A form of microRNA involved in a cancer.oncosisischemic cell death: a process characterized by mitochondrial swelling, cytoplasm vacuolization, and swelling of the nucleus and cytoplasmoncostsplural of oncostoncoticRelating to osmotic pressure caused by the presence of colloids.oncovin(medicine) vincristineondatra(chiefly US, Canada) The muskrat.ondiolaAn electronic musical instrument, an Italian version of the clavioline.onefoldConstituting or being indicative of a single aspect or theme.onegite(mineralogy) A form of amethyst having hair-like inclusions of goethiteonehead(obsolete) Oneness; unity.onehoodUnity; agreement.oneiricOf or pertaining to dreams.oneitis(slang) Attraction towards a single potential partner to the exclusion of other possible partners.oneling(rare) A singleton; maverick; a single or only child.onement(obsolete) The state of being at one or reconciled.oneness(uncountable) The state of being one or undivided; unity.oneraryFitted for, or carrying, a burden.onerate(obsolete) To load; to burden or bedeck.onerousImposing or constituting a physical, mental, or figurative load which can be borne only with effort; burdensome.oneselfA person's self: general form of himself, herself, themself or yourself.oneshipUnity; oneness.oneshot(video games, slang) To kill or destroy with a single hit; to instakill.onesiedWearing a onesie.onesiesplural of onesieonesome(rare) A solitary person or thing; a "group" of one.oneties(nonce word) The second decade of a century: the 1910s, the 2010s, etc. The tens.onetimeAlternative form of one-time (“former; past”).onfieldThat takes place on a sports fieldonglaze(of decoration etc.) Done on a glazed surfaceonglide(phonetics) A phase while the articulators are moving into position to produce a new speech sound.ongoingContinuing, permanent, lasting.onguentArchaic form of unguent.onicoloA variety of onyx for cameos, a bluish-white band on the dark ground.onigiriA Japanese food made by putting ingredients into white rice, wrapping the outside with laver, and shaping it into a triangle.onionedFlavoured or made with onion.onionet(rare, archaic) A small onion.oniscid(zoology) Any of the Oniscidae; a woodlouse.onlinerA person who is online; a user of the Internet or similar service.onloadsthird-person singular simple present indicative of onloadonlucky(obsolete) Pronunciation spelling of unlucky.onomastA person who studies onomastics; a person who studies (proper) names.onshell(mathematics, physics) That conforms to classical physicsonshoreMoving from the sea towards the land.onsides(sports) Onside: in a legal position with respect to the ball and boundariesonsight(climbing) Without having previously seen the terrain.onstageOn the part of a stage that is visible to the audience.onstead(UK, Scotland, dialect, archaic) A single farmhouse; a steading.onsweepA rapid arrival, especially one that is forceful.onticalOf or relating to ontology.onuphid(zoology) Any polychaete worm of the family Onuphidae.onwardsthird-person singular simple present indicative of onwardonyalai(pathology) A form of thrombocytopenia found in Central Africa.onychiaA whitlow (infection near a finger or toe nail)onymity(rare) The state of being onymous.ooblast(biology) A cell that develops into an ovum; a germinal epithelium giving rise to ova.oobleckA mixture of cornstarch and water with unusual physical properties.oocystsplural of oocystoocytesplural of oocyteoocyticRelating to or composed of oocytes.oodachiAlternative spelling of odachi (“sword”).oodlins(informal) Alternative form of oodles (“lots; a great number or amount”).ooecialRelating to the ooecium.ooeciumAn ovicell of a bryozoan.oofbirdAlternative form of oof-bird.oofless(UK, slang) Short of money; poor.ooftish(archaic, British slang) Money.oogenic(biology) That produces oocytesoogenus(taxonomy) An ootaxon, equivalent to a genus, used to classify fossilised dinosaur eggsoogoniaplural of oogoniumoographA mechanical device for drawing the outline of a bird's egg.oojiboo(slang) An unspecified object; thingy; whatsit.oolakanAlternative form of eulachon.oolemmaThe cell membrane of an oocyte.oolicanAlternative form of eulachon.oolitesplural of ooliteoolithsplural of oolithoolitic(geology) Made up of, or containing oolitesoologic(rare) Of or relating to oology.oomancyDivination through the use of eggs.oometerA device for the measurement of eggs.oometryThe measurement of eggs.oomiackAlternative spelling of umiak.oomiaksplural of oomiakoompahsthird-person singular simple present indicative of oompahoonopid(zoology) Any spider in the family Oonopidae.oophagy(zoology) The eating of eggs; (now especially) the cannibalization of subordinate eggs within a homogeneous population or the uterus; particularly as it relates to certain insect and aquatic species.oophore(biology) A form of some ferns and mosses that bear sexual fruit.oophyte(obsolete, biology) gametophyteooplasmThe cytoplasm of an egg or ovumooplastSynonym of oosphere.oopuhue(Hawaii) globefishoosperm(biology) The ovum, after fusion with the spermatozoon in impregnation.oospore(biology) A fertilized female zygote, having thick chitinous walls, that develops from a fertilized oosphere in some algae and fungiootaxon(taxonomy) Any taxonomic classification of egg fossilsoothecaAn egg case of any of the orthopteroid insects (such as cockroaches and mantids).ooziestsuperlative form of oozy: most oozyoozooid(zoology) A zooid that develops from an egg and reproduces by buddingopacate(archaic) To darken; to cloud.opacify(transitive) To make opaque.opacite(geology) A small, dark grain, of doubtful origin, in an igneous rockopacity(uncountable) The state or quality of being opaque, not allowing light to pass through.opacous(obsolete, chiefly poetic) Not shining or illuminated; dark.opaleyeA fish, Girella nigricans, a species of sea chub found in the Eastern Pacific.opalineResembling opal in having a milky white iridescence.opaliseAlternative spelling of opalize.opalishResembling or characteristic of opal.opalite(mineralogy) Opal; some variety of it; an artificial mineral resembling it.opalize(transitive) To convert into a form of opal or chalcedony, especially to convert wood into such a fossilized form.opalledAlternative form of opaled.opaquen(ambitransitive, rare) To make or become opaque.opaquercomparative form of opaque: more opaqueopaquesplural of opaqueopcodesplural of opcodeopenersplural of openeropenessMisspelling of openness.openest(archaic) second-person singular simple present indicative of openopeningpresent participle and gerund of openoperafy(informal, transitive) To make into an opera or into the style of an opera; to make operatic.operand(mathematics, computing) A quantity to which an operator is applied (in 3-x, the operands of the subtraction operator are 3 and x).operantThat operates to produce an effect.operate(transitive or intransitive) To perform a work or labour; to exert power or strength, physical or mechanical; to act.opercle(anatomy, zoology) An operculum.operonsplural of operonoperose(now rare) Of a person: busy, industrious, or painstaking.operousObsolete form of operose.opetide(rare, obsolete) The open time; that part of the year outside Lent when there is no required fast.ophanimplural of ophanophaninA toxin present in the venom of the king cobra Ophiophagus hannahophelicOf or pertaining to felworts, of a former plant genus, Ophelia (now included in Swertia), of the gentian family.ophidic(zoology) Relating to the Ophidia: the snakes and related reptiles.ophitesplural of ophiteophitic(geology) Having crystals of feldspar interspersed with plates of augite.ophiure(rare) Any echinoderm of the class Ophiuroideaophryon(anatomy) The point in the brow just above the optic foramen, or eyesocket, and glabella.ophthal(medicine, colloquial) Ophthalmology.opianyl(chemistry) meconinopiatedsimple past and past participle of opiateopiatesplural of opiateopiaticOf or relating to opiates.opifice(obsolete) workmanshipopinantOne who offers an opinion.opiningpresent participle and gerund of opineopinionThe judgment or sentiment which the mind forms of persons or things; estimation.opioidsplural of opioidoplurid(zoology) Any lizard in the family Opluridae.oporice(obsolete) A medicine prepared from quinces, pomegranates, etc.opossumAny American marsupial of the family Didelphidae in the order Didelphimorphia.oppidan(also Oppidan) A class of student in traditional English public schools such as Eton; opposed to colleger or King's Scholar.oppidumA large, defended Iron Age settlement associated with the Celtic La Tène culture.opplete(obsolete) full; crowdedopposal(archaic) oppositionopposedActing in opposition; opposing.opposeeOne against whom there is opposition; the opposed party.opposerOne who opposes, one who shows opposition.opposesthird-person singular simple present indicative of opposeoppositto posit or assume as a contradictory; negative or denyopposumMisspelling of opossum.oppress(transitive) To keep down by unjust force.opsonicRelating to, produced by, or involving opsonin.opsoninAny chemical produced by the body, including antibodies and complement proteins, that causes a pathogen to be more susceptible to phagocytosis.optable(obsolete) That may or should be chosen; desirable.opticalOf or relating to sight; visual.opticksObsolete form of optics.optimalThe best, most favourable or desirable, especially under some restriction.optimumThe best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.optionsplural of optionoptiqueObsolete form of optic.optivar(medicine) azelastineoptotag(genetics) To employ optotagging as part of optogeneticsoptrodeAlternative spelling of optode.opulentLuxuriant, and ostentatiously magnificent.opuntiaOpuntia, a genus of cactus that includes such cacti as the prickly pear and xoconostle.opuscleObsolete form of opuscule.orachesplural of oracheoraclesplural of oracleoraisonObsolete form of orison.oralise(chiefly UK) To speak out something that is written, to turn something written into something oral.oralismA philosophy of education for the deaf, opposed to manualism, that uses spoken language consisting of lipreading, speech, the process of watching mouth movements, and mastering breathing techniques.oralistA supporter of oralism.oralityThe state of being oral.oralize(uncommon, vulgar, slang) To perform oral sex upon.oralloy(nuclear physics, historical) Highly-enriched uranium.orangercomparative form of orange: more orangeorangesplural of orangeorangeySomewhat orange in colour.orangie(Ireland, offensive, slang) A pro-British Ulster Protestant.orankay(obsolete) In the Malay Archipelago, a person of distinction, a chief or noble.orantesplural of oransorarian(archaic) Of or pertaining to a coast.orarionA deacon's stole in the Eastern Orthodox Church.orarium(religion) A collection of private devotions.oratingpresent participle and gerund of orateorationA formal, often ceremonial speech.oratorsplural of oratororatoryA private chapel or prayer room.oratourObsolete form of orator.oratrix(obsolete) A female plaintiff, or complainant, in equity pleadingoratureThe oral equivalent of literature: a collection of traditional folk songs, stories, etc., that is communicated orally rather than in writing.orbicalSynonym of orbicular.orbicle(obsolete) A small orb or sphere.orbitalOf or relating to, or forming an orbit (such as the orbit of a moon, planet, or spacecraft).orbitar(obsolete, anatomy) orbital.orbitedsimple past and past participle of orbitorbiterAn object that orbits another, especially a spacecraft that orbits a planet etc. without landing on it.orbiton(particle physics) A quasiparticle, corresponding to the orbital energy of an electron, which can result from an electron apparently ‘splitting’ under certain conditions.orblessWithout an orb or orbs.orblikeResembling an orb.orchardA garden or an area of land for the cultivation of fruit or nut trees.orchidsplural of orchidorchiesplural of orchieorcinol(organic chemistry) A natural phenolic organic compound that occurs in many species of lichen, used in the production of orcein and as a reagent in some chemical tests for pentosesorckindAll orcs, considered as a group.orculid(zoology) Any snail in the family Orculidae.ordainsthird-person singular simple present indicative of ordainordealsplural of ordealorderedIn order, not messy, tidy.ordererA person who orders, or who places an orderorderlyNeat and tidy; possessing order.ordinal(mathematics, of a number) Indicating position in a sequence.ordineeAlternative form of ordainee.ordinesplural of ordoordrelyObsolete form of orderly.oreadesplural of oreadoreboat(nautical) A vessel used to transport iron ore on the Great Lakesorebodya mass or region of oreorecticOf or pertaining to desire or appetiteoreganoA herb of the mint family, Origanum vulgare, having aromatic leaves.oreweedAlternative form of oarweed.orewoodObsolete form of oarweed.orfgild(law, historical) A delivery or restitution of cattle; compensation for the loss of cattle.organal(music) Relating to organum.organdyA fine, transparent type of muslin, usually stiffened.organic(biology) Pertaining to or derived from living organisms.organonA set of principles that are used in science or philosophy.organum(music) A type of medieval polyphony which builds upon an existing plainsong.organyl(chemistry) any univalent radical having its free valence at a carbon atomorganzaA thin, stiff, sheer fabric that is made from silk or a synthetic yarn, which resembles organdy, and is used in dressmaking.orgasmsplural of orgasmorgiastOne who attends an orgy.orgonicRelating to orgoneorgueil(archaic) Pride.oriency(archaic) Brightness or strength of colour.orientsthird-person singular simple present indicative of orientorificeA mouth or aperture, such as of a tube, pipe, etc.; an opening.origami(uncountable) The Japanese art of paper folding.origaneAlternative form of oregano (“wild marjoram, Origanum vulgare”).originsplural of originorignal(obsolete) A moose.origyneObsolete form of origin.orillonA semicircular projection made at the shoulder of a bastion for the purpose of covering the retired flank, found in old fortresses.oriolesplural of orioleoriolid(zoology) Any bird in the family Oriolidae.oriscus(music) An ornamental neume of unclear meaning, usually found added to another neume as an auxiliary note.orishasplural of orishaorisonsplural of orisonoritangA slow-cooked Korean stew of duck and vegetables.ormizet(medicine, dated) An astringent preparation of clay saturated with formic acid.ormyrid(zoology) Any wasp in the family Ormyridae.oroanalInvolving the mouth and anus.orogeny(geology) The process of mountain building by the upward folding of the Earth's crust.oroidin(organic chemistry) Any of a family of alkaloids derived from marine spongesorology(geomorphology, obsolete, rare) The study or science of mountains and their formation.oronymyThe nomenclature of mountains, hills and other geographic rises.orotate(chemistry) Any salt or ester of orotic acid.orotone(photography) A photographic print on glass, decorated with gold leaf or coloured with a gold pigment.orotundOf writing, etc.: clear, effective, powerful.orpedly(obsolete) Boldly; bravely; stoutly.orphaneObsolete spelling of orphan.orphansplural of orphanorphantObsolete form of orphan.orphany(rare) Synonym of orphanry.orphingPronunciation spelling of orphan.orphrayAlternative spelling of orphrey.orphrey(Christianity) An embroidered ornamental band or border on an ecclesiastical vestment, altar frontal, etc.orsedew(archaic) Dutch metal; bronze leaf used as imitation gold leaf.orsedueAlternative form of orsedew.ortalid(obsolete) A fly of the family Ortalidae (now Ulidiidae).orthant(geometry) A n-dimensional generalization of the quadrant (in two-dimensional Cartesian space) and octant (in three-dimensional space).orthentA kind of shallow or "skeletal" soil, found on recent erosional surfaces or very old landforms completely devoid of weatherable minerals.orthianDenoting a type of singing at a very high pitch.orthideAlternative form of orthid.orthite(mineralogy) A variety of allanite occurring in slender prismatic crystalsorthros(Eastern Orthodoxy) The divine office or service at dawn.ortolanA small European migratory bunting (Emberiza hortulana), once eaten whole as a delicacy.ortygan(obsolete) Any of various buttonquails.orussid(zoology) Any wasp of the family Orussidae.orygineRelating to, or characteristic of an oryxoryzeinMisspelling of oryzenin.oryzoidOf or pertaining to rice-like plants of the Oryzoideae.osakate(sumo) A kimarite in which the attacker, grappling near the edge, bends backwards and swings his opponent around and out.osalmid(pharmacology) A choleretic drug.osazone(organic chemistry) any glycoside of an aldose or 2-ketose formed by reaction with excess of an aryl-hydrazineoscinesplural of oscineoscnode(geometry) A node of a plane curve where two branches meet with contact order 3.oscularOf or pertaining to the mouth.osculum(chiefly zoology) A small opening or orifice.oshamnuAlternative form of ashamnu.oshinkotraditional Japanese pickled vegetable mixosiered(poetic) Covered or adorned with osiers.osladinA particular steroid glycoside.osmaticRelating to the sense of smell.osmerid(zoology) Any fish of the family Osmeridae, a smelt.osmiate(inorganic chemistry) osmateosmious(chemistry) Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds.osmolalOf or pertaining to osmolality.osmolarOf or pertaining to osmolarityosmolesplural of osmoleosmosedsimple past and past participle of osmoseosmosesplural of osmosisosmosis(chemistry) The net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration through a partially permeable membrane.osmoticRelating to, or powered by, osmosis.osmotin(biochemistry) An antifungal protein that provides protection from osmotic stressosmunda(botany) A fern of the genus Osmunda, especially the royal fern, Osmunda regalis.osmundsplural of osmundosmylid(zoology) Any lacewing in the family Osmylidae.ospreysplural of ospreyosseinsplural of osseinosseousOf, relating to, or made of bone; bony.osseter(zoology) Acipenser gueldenstaedtii, the Russian sturgeon.ossetraAlternative form of osetra (“type of caviar”).ossicle(anatomy) A small bone (or bony structure), especially one of the three of the middle ear.ossifer(humorous) A police officer.ossificCapable of producing bone; having the power to change cartilage or other tissue into bone.ossuaryA container, receptacle, or building, such as an urn or vault, for holding the bones of the dead.osteoidOf, pertaining to, or characteristic of bone; bonelikeosteoma(medicine, pathology) A benign bony tumour that typically grows on the skull.osteoneAlternative spelling of osteon.osteriaA small local restaurant in (usually rural) Italy.osterixA transcription factor, containing a zinc finger, that functions in osteoblast differentiation and bone formation.ostiaryOne who keeps the door, especially the door of a church; a porter.ostikan(historical) Any of the Arab governors of Armenia.ostiole(mycology) A small hole or opening through which certain fungi release their mature spores.ostiticAlternative form of osteitic.ostitisArchaic form of osteitis.ostlersplural of ostlerostlery(obsolete) hostelry (inn)ostmark(historical) The currency unit of the former German Democratic Republic (aka GDR, DDR, East Germany) until 1990, abbreviated DDM.ostosis(physiology) Synonym of osteosis.ostoticRelating to ostosisostracaplural of ostraconostrakaplural of ostrakonostreid(zoology) Any member of the family Ostreidae, the oysters.ostrich(ornithology) A large flightless bird of the order Struthioniformes.ostrigeObsolete form of ostrich.otalgia(pathology) earacheotalgic(pathology, pharmacology) Of or pertaining to otalgia.otariesplural of otaryotariid(mammology) Any member of the Otariidae: Synonym of eared seal.otarine(zoology) Of or relating to the eared seals.otavite(mineralogy) A rare trigonal cadmium carbonate mineral.otemellObsolete form of oatmeal.othererOne who others.otherlyPertaining to something or someone else; different.otoconeThe conical part of an otoscope that is inserted into the earotocyst(invertebrate zoology) An organ involved in balance and orientation.otoitid(zoology) Any ammonite in the family Otoitidae.otoliteAlternative form of otolith.otolith(anatomy) A small particle, composed mainly of calcium carbonate, found in the inner ear of vertebrates, being part of the balance sense.otology(medicine) The branch of medicine that deals with the ear, its structure, function and pathology.ottoman(furniture) An upholstered sofa, without arms or a back, sometimes with a compartment for storing linen etc.ottsuke(sumo) A hold on an opponent's armotubain(biochemistry) Any of a family of proteases associated with ovarian tumoursouabainA poisonous cardiac glycoside, g-strophanthin, found in the seeds of certain lianas.ouakariAlternative form of uakari.ouarineA howler monkey (Alouatta spp.).oughtstAlternative form of oughtest.ouguiyaThe currency of Mauritania, divided into five khoums.ouiaboo(Internet slang, often derogatory) A non-French person who is obsessed with France and French culture, a Francophile.oulakanAlternative form of eulachon.ounging(forestry) The process of assisting logs in their downstream motion by pushing them through the water.ouphish(obsolete) elflike; elfinouretic(chemistry, obsolete) uricourisia(taxonomy) Any plant of the genus Ourisia.ourself(reflexive pronoun) The reflexive of the generic we: oneself.oustersplural of ousteroustingpresent participle and gerund of oustoustitiA tool for opening a locked door by turning an inner key from the outside.outagesplural of outageoutardeAlternative form of outard.outback(Australia) The most remote and desolate areas of Australia; the desert and areas too arid for growing crops.outbake(transitive) To surpass in baking; to bake better than.outbark(transitive) To surpass in barking.outbaseA minor storage depot used to back up the transport and delivery operations from the main depot.outbawl(transitive) To bawl louder or longer than.outbeam(transitive) To beam more brightly than; to outshine.outbear(transitive) To bear out; support.outbeat(non-native speakers' English, transitive) To beat or surpass; to outdo.outbentbent outwardsoutbest(transitive) To be better at something.outbidsthird-person singular simple present indicative of outbidoutbike(transitive) To bike better or faster than; to surpass in bikingoutblewsimple past of outblowoutblog(transitive) To blog more successfully or better than; to surpass or get the advantage of in blogging.outblot(transitive, literary) To blot out.outblow(transitive) To blow out (all senses)outbond(construction) Of a brick or stone: laid with its length parallel to the face of the wall.outboob(transitive, slang) To have bigger breasts than.outboresimple past of outbearoutbornMoved, carried, or expressed outwardly.outbowl(transitive) To beat at bowling.outbrag(transitive) To surpass in bragging.outbray(transitive) To exceed in braying.outbredsimple past and past participle of outbreedoutbulk(transitive) To exceed in bulk.outburn(intransitive) To burn away; be consumed by fire.outburp(informal, transitive, rare) To burp louder or better than.outbuttTo butt with greater force than; to best in a butting match.outbuzz(transitive) To buzz louder or better than; to surpass in buzzing.outcallA visit by a provider of some service, such as a massage therapist or a prostitute, to a client.outcant(transitive, obsolete) To surpass in canting; to use more jargon than.outcast(transitive) To cast out; to banish.outchieAlternative form of ouchie.outchip(poker, rare) To have more (poker chips) than.outcodeThe first part of a United Kingdom postcode, before the space.outcomeThat which is produced or occurs as a result of an event or process.outcook(transitive) To surpass in cooking; to cook better than.outcool(transitive) To surpass in cool; to be more cool (hip, fashionable, etc.) than.outcropA piece of land that stands out (usually into water) from the land surrounding.outcrow(transitive) To surpass in crowing.outcure(transitive) To cure more effectively than; to surpass in curing.outcurl(intransitive, poetic) To curl outward.outcuss(US, colloquial) To outcurse.outdare(transitive) To dare beyond; to be more bold or daring than.outdash(transitive) To dash faster than.outdate(British, rare) Old-fashioned, out of date; outdated.outdentA hanging paragraph.outdoerOne who, or that which, outdoes.outdoesthird-person singular simple present indicative of outdooutdonepast participle of outdooutdoorSituated in, designed to be used in, or carried on in the open air.outdrag(transitive) To outperform in a drag race.outdrawTo extract or draw out.outdrewsimple past of outdrawoutdrop(baseball) Synonym of outcurve.outduel(transitive) To duel better than (someone else).outdumb(transitive) To surpass in dumbness; to be dumber than.outdure(transitive, obsolete) To endure beyond; to outlast.outearn(transitive) To make more money than, to earn more than.outecho(transitive) To echo more loudly than.outedge(transitive, archaic) To edge out.outener(chiefly dialectal) A foreigner.outerlyOuter; not internal.outface(transitive) To disconcert someone with an unblinking face-to-face confrontation; to stare down; to withsayoutfake(transitive) To fake or fake out more or better than (another)outfall(transitive, obsolete) To burst forth, as upon an enemy; make a sally.outfame(transitive) To become more famous than, particularly in a competitive sense.outfart(transitive, slang) To fart louder or more than.outfast(transitive) To surpass in fasting, or abstention from food.outfawn(transitive, rare) To exceed in fawning.outfeat(rare) To surpass in feats, to outperform.outfeedA conveyor that pulls split firewood away from the processor and into a waiting vehicle or pile for later handling.outfeel(transitive) To feel more accurately or more acutely than.outfellsimple past of outfalloutfind(obsolete, poetic, transitive) To find out; to discover.outfire(Sussex) A visit by one bonfire society to join in with the celebrations of another.outfish(transitive) To catch bigger (or more) fish than.outfitsplural of outfitoutflee(poetic, transitive) To flee beyond; to outrun.outflewsimple past of outflyoutflowThe process of flowing out.outflux(intransitive) To exit out of a defined zone.outfoldTo fold outward.outfool(transitive) to be more foolish than.outfoot(transitive) To run or travel faster thanoutform(obsolete) external appearanceoutfuck(transitive, vulgar, rare) To fuck better or more than; to be superior to at sexual intercourse.outfundTo fund more than; to outdo in funding.outgain(transitive) To outperform on a quantitative measurement.outgame(transitive) To surpass in gaming; to defeat in a game.outgangAn exit or egress.outgateAn outlet; a passage outward.outgavesimple past of outgiveoutgaze(transitive) To gaze beyond; to exceed in sharpness or persistence of seeing or of looking.outgive(transitive) To surpass in giving; to give more than.outglow(transitive) To glow brighter thanoutgnaw(transitive) To gnaw more or better than; to surpass in gnawing.outgoerOne who or that which goes out or departs.outgonepast participle of outgooutgrewsimple past of outgrowoutgrin(transitive) To surpass in grinning.outgrow(transitive) To grow faster or larger than.outgush(intransitive) To gush or flow outward.outhack(transitive, computing) To surpass in hacking.outhalf(Ireland, rugby) fly-halfouthaul(transitive) To haul out.outhear(transitive) To hear more acutely than.outhike(transitive) To hike longer, farther, and/or faster than.outhire(obsolete, rare, transitive) To hire out.outhiss(transitive) To surpass in hissing.outhitsthird-person singular simple present indicative of outhitouthold(UK dialectal) To hold out; extend.outhole(pinball) The hole at the bottom of a pinball table where each ball is eventually lost.outhowl(transitive) To howl louder or longer than.outhunt(transitive) To surpass in hunting.outhurl(transitive) To surpass in hurling or throwing.outhype(transitive) To exceed in hype.outingsplural of outingoutjazz(transitive) To surpass in playing jazz music.outjeer(transitive) To surpass in jeering.outjoke(transitive) To surpass in joking; to outjest.outjuke(transitive, sports) To perform better jukes on one's opponent.outjump(transitive) To jump better than; particularly higher than, or further than.outkeep(transitive) To keep or last, without spoiling, longer than.outkick(transitive) To kick more than, or beyond, something or someone.outkiss(transitive) To surpass in kissing; to kiss more or better than.outknit(transitive) To surpass in knitting; to knit more or better than.outlandProvincial: from a province (of the same land).outlane(pinball) One of the outer lanes toward the bottom of a pinball table that cause the ball to drain if not propelled back upwards.outlashThe act of somebody lashing out.outlast(transitive) To live, last or remain longer than.outlawsplural of outlawoutlaysplural of outlayoutleadTo bring about; to encourage.outlean(intransitive, poetic) To lean outward.outleapA sally; flight; escape.outletsplural of outletoutlettObsolete spelling of outlet.outlick(transitive) to lick better than.outlierA person or thing situated away from the main body or outside its proper place.outlift(transitive) To lift more weight than.outlimn(transitive) To sketch out or delineate.outlineA line marking the boundary of an object figure.outlink(Internet) A hyperlink from a webpage to an external website.outlive(transitive) To live longer than; continue to live after the death of; overlive; survive.outload(ambitransitive, especially military) to load (a watercraft etc.) with supplies or personnel.outlookA place from which something can be viewed.outloud(rare, nonstandard, proscribed) Alternative form of out loud.outlove(transitive) To love more than somebody else.outmark(transitive, Australian rules football) To surpass in marking.outmate(zoology) To mate with an individual who is not part of one's immediate social group.outmode(transitive) To render (something) no longer fashionable.outmostsuperlative form of outer: most outer; farthest outside; as far from the center or inside as possible.outmove(transitive) To move faster or more skilfully than; to outmaneuver.outname(obsolete, transitive) To exceed in naming or describing.outnessThe quality of being out, or outside.outnice(transitive, rare) To surpass in apparently nice behaviour; to make oneself seem nicer than.outpace(transitive) To go faster than; to exceed the pace of.outpartAn outlying part.outpass(transitive) To surpass or exceed.outpeal(transitive) To surpass in pealing; to peal louder than.outpeep(archaic, poetic, intransitive) To peep out.outpeer(archaic, transitive) To excel or surpass.outpick(transitive) To surpass in picking; to pick better or faster than.outpipeA pipe serving as an outlet.outpiss(informal, transitive, vulgar) To urinate longer, higher, in a greater quantity, etc., than.outplan(transitive) To surpass in planning.outplay(transitive) To excel or defeat in a game; to play better than.outplod(transitive) To plod further or faster than.outplot(transitive) To surpass in plotting or scheming.outpoll(transitive) To defeat in a poll.outpomp(transitive) To surpass in pomp.outpopeOnly used in outpope the PopeoutportA port city or harbor which is secondary to a main port; it may be a distant one or a nearby auxiliary one.outpostA military post stationed at a distance from the main body of troops.outpourThe act of pouring out.outpray(transitive) To exceed or surpass in prayer.outpuff(transitive) To puff harder or better than; to outblow.outpull(transitive) To surpass in pulling.outpush(transitive) To surpass in pushing; to push harder or longer than.outputsplural of outputoutputt(golf) to putt better thanoutrace(transitive) To travel faster than another in a competitive event.outrageAn excessively violent or vicious attack; an atrocity.outrangsimple past of outringoutrank(transitive) To be of a higher rank than.outrant(transitive) To surpass in ranting.outrateTo get a higher rating than something or someone elseoutrave(transitive) To surpass in raving.outride(equestrianism) A trip on a horse outside an enclosed area, a trip on a horse in the open.outring(transitive) To surpass in volume of ringing sound; to ring louder than.outrive(obsolete) To rive; to sever.outroadA way out from a place or situation.outroar(transitive) To roar louder than.outrock(transitive) To surpass in rocking (thrilling or exciting, especially with rock music).outrodesimple past of outrideoutrollTo roll outward; to unroll or unfold with a rolling motion.outroop(obsolete) A sale by auction.outroot(transitive) To eradicateoutrope(transitive) To exceed in roping; to rope better than.outrovesimple past of outriveoutruck(rugby) To outplay an opponent in a ruckoutrule(transitive) To rule out; to eliminate by deduction.outrunsthird-person singular simple present indicative of outrunoutrush(intransitive) To rush outward; to issue forcibly.outsail(transitive) To sail faster or further than.outsangsimple past of outsingoutsave(transitive) To save more money than.outscam(informal, transitive) To surpass in scamming.outseamThe seam of a trouser up the outside of the leg.outseek(transitive) To seek out; actively or diligently search for; investigate; research.outsell(transitive, stative) To sell more than; to surpass in sales.outsend(transitive) To send out or forth; issue; emit; transmit; broadcast.outsertA piece of promotional material that is placed on the outside of a product.outsetsplural of outsetoutshedAn outbuilding.outshop(UK) To send a railway vehicle out from a workshop or factory after construction or overhaul.outshotsimple past and past participle of outshootoutshow(transitive, puristic or archaic) To show or present publicly; exhibit openly.outshut(archaic) To shut out.outsideThe part of something that faces out; the outer surface.outsift(transitive, poetic, archaic) To sift out.outsigh(transitive) To surpass in sighing; to sigh more or better than.outsing(transitive) To sing better, longer or louder than.outsizeAn unusually large garment size.outskinAn outer skin; surface.outskip(transitive) To avoid by flight or fleeing; escape.outslip(obsolete, transitive) To escape, to slip away from.outslug(transitive, baseball) To score more runs than.outslutAlternative form of out-slut.outsnap(transitive, informal) To outphotograph.outsnob(transitive) To surpass in snobbery; to be snobbier than.outsoar(transitive) To soar beyond or above.outsoldsimple past and past participle of outselloutsoleThe underside of a shoe or other footwear, which makes contact with the floor.outspan(South Africa, transitive) To release oxen from a harness.outspin(transitive) To spin out; finish; exhaust.outspit(transitive) To surpass in spitting; to spit more or further than.outstat(transitive, informal) To have better statistics than.outstay(transitive) To stay beyond or longer than.outstep(transitive) To step or go beyond; exceed; overstep.outsuck(transitive) To suck more or better than.outsulk(transitive) To sulk more than.outsungpast participle of outsingoutswamsimple past of outswimoutswap(transitive, computing) Synonym of swap out.outswim(transitive) To swim faster, farther or better than.outtakeA complete version of a recording or film that is dropped in favour of another version, reject.outtalk(transitive) To overpower, outdo, or surpass in talking.outtask(business) To transfer the responsibility for a specific task to a third-party service provider.outtell(transitive) To surpass in telling, counting, or reckoning.outtire(transitive, archaic) To tire out; to exhaust.outtooksimple past of outtakeouttrot(transitive) To trot faster than.outturnAn amount produced during a specified period; output or turnoutoutvote(transitive) To cast more votes than anotheroutwait(transitive) To wait for something to end.outwalkTo walk further than another.outwallAn exterior or outer wall.outwardOuter; located towards the outside.outwash(geology) The sediment (mostly sand and gravel) deposited by water flowing from a melting glacier.outwave(transitive) To surpass in waving; to wave more than.outwear(transitive) To outlast; to survive longer than: to outlive.outweed(obsolete) To weed out.outweep(transitive) To weep more than.outwell(archaic, ambitransitive) To well outward; to issue forth.outwentsimple past of outgooutwick(transitive) To play (one's stone) in a way that it hits the outer edge of another stone, causing the latter to move towards the tee.outwile(rare, transitive) To surpass in wile or cunning.outwill(transitive) To surpass in force of will.outwind(transitive) To extricate by winding; to unloose.outwing(transitive) To surpass or outstrip in flying.outwish(transitive) To wish harder than.outwith(now chiefly Scotland) Outside; beyond; outside of.outwitsthird-person singular simple present indicative of outwitoutwokesimple past of outwakeoutworesimple past of outwearoutwork(transitive) To work more, faster, or harder than (someone else).outwornpast participle of outwearoutwovesimple past of outweaveoutyard(American football) To gain more yards than.outyell(transitive) To yell more loudly than.outyelp(transitive) To yelp louder or longer than.outzany(rare) To exceed in buffoonery.ouvrierA French labourer or manual worker.ouzeriaAlternative form of ouzeri (“Greek taverna”).ovalene(organic chemistry) A polycyclic aromatic hydrocarbon containing eight fused benzene rings.ovaline(nonstandard) Synonym of oval: having an elongated round shape.ovaling(engineering) Alternative form of ovalling.ovaliseAlternative form of ovalize.ovalishApproximately oval-shaped.ovality(engineering) a measurement of deviation from circularity of an oval or approximately elliptical shape.ovalizeOf a circle, to become stretched out in one direction, thereby becoming an oval.ovaloidApproximately oval.ovarial(dated) Relating to the ovaries; ovarian.ovarian(medicine) Relating to the ovaries.ovaried(in combination) Having a specified form of ovariesovariesplural of ovaryovarium(archaic) An ovary.ovatelyIn an ovate manner.ovation(Ancient Rome) A victory ceremony of less importance than a triumph.ovenfulAs much as an oven will hold.overact(intransitive, chiefly acting) To act in an exaggerated manner.overageHaving an age that is greater than a stipulated minimum.overallAll-encompassing, all around.overamp(informal, intransitive) To become very excited, especially as a result of ingesting amphetamines.overaptExcessively apt or prone to do something.overarmThrowing while having the hand above the elbowoveratesimple past of overeatoverawe(transitive) To restrain, subdue, or control by awe; to cow.overbarA line placed above text; the character ‾ (◌̅).overbedAbove a bed (in various senses).overbet(poker) A bet which is more than standard for a particular situation.overbid(intransitive) To make an excessively high offer to pay or accept a price.overbigExcessively big.overbitsimple past of overbiteoverbow(transitive) To bow or bend (something) over beyond its natural trajectory; to bend in a contrary direction.overbuyTo buy excessively, especially to buy more than one needs or can afford.overcoyExcessively coy.overcupThe oak Quercus lyrata whose acorns are enclosed by their cupsovercut(transitive) To cut excessively.overdidsimple past of overdooverdogsomeone who is dominant or has a significant advantage in their fieldoverdotA dot placed above a letter, as a diacritical mark.overdryTo dry too much.overdub(sound engineering) To record a part along with an already recorded part or parts.overdueLate; especially, past a deadline or too late to fulfill a need.overdye(transitive) To dye (something already coloured) with another colour.overeat(intransitive) To eat too much.overegg(transitive, idiomatic, originally UK, regional) Chiefly in over-egg the pudding: to spoil (something) by exaggerating it, or an aspect of it; to overdo.overeye(transitive, obsolete) To superintend; inspect; observe; witness.overfarExcessively far.overfatHaving too much fat as a proportion of body mass.overfedExcessively fed; given too much to eat; having had too much to eat.overfix(transitive) To fix exceedingly or excessively; fix beyond what is requiredoverflyTo fly over something.overfry(transitive) To fry for too long.overfulObsolete spelling of overfull.overget(ambitransitive) To get more than expected or due.overhie(chiefly Scotland) To overtake; to catch up with.overhip(transitive, obsolete) To leap over; skip over; omit.overhitTo hit too far or too hard.overhotExcessively hot.overhug(ambitransitive) To hug excessively or too much.overingpresent participle and gerund of overoverink(transitive) To apply too much ink to.overish(UK dialectal) Qualmish; weak; alarmed; nervous.overite(mineralogy) A form of segelerite in which the iron is replaced by aluminium.overjet(dentistry) The extent of horizontal overlap of the maxillary central incisors over the mandibular central incisors.overjoy(transitive) To give great joy, delight or pleasure to.overjut(transitive) To jut out over.overlapTo extend over and partly cover something.overlaxExcessively lax.overlay(transitive) To lay, spread, or apply (something) over or across (something else); to overspread.overlieTo lie over or uponoverlip(now uncommon) The upper lip.overlitsimple past and past participle of overlightoverlowExcessively low.overmanA person who supervises others; a supervisor, especially in a mine.overmixTo mix too thoroughlyovernap(transitive, colloquial, rare) To take too many short sleeps.overnet(transitive) To cover with a net or netting.overnim(transitive, archaic) To overtake; seize.overoil(transitive) To oil too much.overpad(transitive) To pad excessively; to fill with too much padding.overpay(ambitransitive) To pay too much.overpet(transitive) To pet excessively.overply(transitive) To ply to excess; to exert with too much vigour; to overwork.overpot(transitive) To place (a plant) in too large a pot.overput(transitive) To overthrow; subdue.overramThe incorrect seating of the charge of a firearm in this manner.overransimple past of overrunoverredExcessively red.overrenObsolete form of overrun.overrev(transitive) To rev (an engine or vehicle) too much.overrun(transitive) To defeat an enemy and invade in great numbers, seizing the enemy positions conclusively.oversadExcessively sad.oversawsimple past of overseeoversayTo say over again; to repeat.oversea(chiefly British) Alternative form of overseas.oversee(literally) To survey, look at something in a wide angle.oversetTo knock over or overturn (someone or something); to capsize, to upset.oversewTo sew together the edges of two pieces of fabric, with every stitch passing over the join.oversit(transitive) To preside over, govern, rule; to control.overskyThe sky that is directly above one, as opposed to that seen on the horizon.oversowTo sow (seed) where something has already been sown.oversumA whole that is more than the sum of its parts; superaddition.oversup(obsolete) To eat (supper) excessivelyovertag(transitive) To place too many tags on.overtan(transitive, intransitive) To tan excessively.overtaxTo tax to an excessive degree.overtip(ambitransitive) To leave a tip that is too large.overtlyIn an overt manner; publicly; openly.overtop(transitive) To be higher than; to rise over the top of.overtry(transitive) To spend too much time or resources in trying (a legal case).overuse(transitive) To use too much of (something); to use (it) too often.overwax(transitive) To apply too much wax to.overwet(transitive) To make too wet; to make wetter than required.overwin(transitive, UK dialectal) To overcome; gain one's point; exceed.overwit(transitive, obsolete) To outwit.ovicell(zoology) One of the dilatations of the body wall of Bryozoa in which the ova sometimes undergo the first stages of their developmentovicideAny substance designed to kill eggs, especially the eggs of insects.oviduct(anatomy, typically used in zoology) A duct through which an ovum passes from an ovary to the uterus or to the exterior.ovipara(zoology) oviparous organismsovipary(biology) The laying of eggs by an animal.ovisticRelating to ovism.ovitrapA device that resembles the preferred breeding site of mosquitoes, used to attract them and capture their eggs in scientific studies.ovoidalsomewhat ovoidovology(archaic) The study of eggs.ovonicsA form of electronics that uses materials able to change from an electrically non-conducting state to a semiconducting state shown by glass of special composition upon application of a certain minimum voltage.ovulary(botany) The structure that contains an ovule or ovules in a flowering plant.ovulate(intransitive) To produce eggs or ova.ovulist(biology, historical) A believer in the theory (ovism or ovulism) that an organism is entirely preformed in the egg, and that at the time of fecundation the spermatozoa simply gives the impetus which caused the unfolding of the egg, in which all generations are enclosed one within the other.owendawAlternative form of awendaw.oweniid(zoology) Any polychaete worm of the family Oweniidae.owlbear(fantasy) A monstrous creature resembling a bear with a beak.owllessLacking owls; without an owl.owllikeResembling or characteristic of a owl.ownableCapable of being ownedownings(rare) Things owned; possessions.ownnessThe property of being one's own.ownsomeMarked by possession, ownership, or belonging; proper.owtchieAlternative form of ouchie.oxalate(organic chemistry) Any salt or ester of oxalic acid.oxaline(archaic, organic chemistry)imidazoleoxalite(mineralogy) A yellow mineral, one of the oxalates of iron.oxamate(chemistry) The carboxylate anion of oxamic acid.oxamide(organic chemistry) A white crystalline solid, the double amide of oxalic acid, used as a stabilizer for nitrocellulose preparations and as a substitute for urea in fertilizers.oxantelA particular kind of anthelmintic that is used to cure intestinal parasites.oxazine(organic chemistry) Any unsaturated six-membered heterocycle containing four carbon atoms, one oxygen, one nitrogen atom and two double bondsoxazole(organic chemistry) A five-membered heterocycle having three carbon atoms, one oxygen atom, one nitrogen atom and two double bonds; the 1,3- isomer is aromaticoxazoneSynonym of oxazinone used especially in the name of some dyesoxbloodA dark brownish-red colour.oxcartsplural of oxcartoxdrawnDrawn or pulled by oxen.oxenium(obsolete, chemistry) oxyliumoxepane(organic chemistry) A saturated seven-membered heterocycle having six carbon atoms and one oxygen atomoxepine(organic chemistry) An unsaturated seven-membered heterocycle having six carbon atoms, one oxygen atom and three double bondsoxetane(chemistry) Any of a class of heterocyclic compounds having a four-membered ring containing 3 carbon atoms and 1 oxygen atom; the parent compound C₃H₆O.oxetene(organic chemistry) Synonym of oxete.oxetose(biochemistry) Any monosaccharide having a configuration with a four-membered ringoxfleshThe flesh or meat of an ox or similar bovine; beefoxfordsplural of oxfordoxheartA large heart-shaped cherry.oxidane(inorganic chemistry) An IUPAC-compliant name for water, H₂O.oxidantan oxidizing agentoxidase(biochemistry) Any of many enzymes which catalyze oxidation reactions, especially ones using molecular oxygen.oxidate(dated, chemistry) To oxidize.oxidise(British spelling) Alternative spelling of oxidize.oxidize(chemistry, transitive) To combine with oxygen or otherwise make an oxide.oximate(organic chemistry) To cause or to undergo oximation.oxinate(chemistry) The complex formed between oxine and a metal ion.oxindolArchaic form of oxindole.oxiodic(chemistry, archaic) Pertaining to, or designating, certain compounds of iodine and oxygen.oxirane(organic chemistry) A three-membered heterocycle having two carbon atoms and one oxygen atom; ethylene oxideoxirene(organic chemistry) The unsaturated three-membered heterocycle having two carbon atoms, one oxygen atom and one double bondoxirose(biochemistry) Any monosaccharide having a configuration with a three-membered ringoxishly(rare) In a manner like that of an ox.oxoacidAlternative form of oxyacid.oxocane(organic chemistry) A saturated eight-membered heterocycle having seven carbon atoms and one oxygen atomoxocine(organic chemistry) An unsaturated eight-membered heterocycle having seven carbon atoms, one oxygen atom and three double bondsoxoironA hypervalent form of iron formed by binding with an oxygen atomoxolane(organic chemistry) tetrahydrofuranoxonane(organic chemistry) A saturated heterocycle that has eight carbon atoms and an oxygen atomoxonate(chemistry) A salt of oxonic acid.oxonian(mineralogy) Containing oxygen.oxonine(organic chemistry) The unsaturated nine-membered heterocycle having eight carbon atoms, one oxygen atom and four double bondsoxonium(inorganic chemistry) Any univalent oxygen cation derived from water, the simplest of which is the hydronium ion (H₃O⁺).oxotype(cytology) A type of cell that has a particular oxygen uptake rateoxtailsplural of oxtailoxyacid(chemistry) An acid containing oxygen.oxybate(organic chemistry, pharmacology) Contraction of gamma-hydroxybutyrate.oxycone(paleontology, malacology) A type of ammonoid with a slim, disk-shaped (oxyconic) shell.oxydizeObsolete spelling of oxidize.oxyfuelA combination of fuel and oxygen, especially when used in welding etc.oxylineA particular steroid glycoside.oxylithA substance, containing sodium peroxide and other salts, which releases oxygen upon contact with water.oxylium(chemistry) Any cation such as H-O⁺ or R-O⁺oxymoraplural of oxymoronoxynoid(zoology) Any gastropod in the family Oxynoidaeoxyntic(immunology) Producing acid.oxyopiaExcessive acuteness of sight.oxyopid(zoology) Any spider in the family Oxyopidae (lynx spiders).oxysalt(chemistry) A salt of an oxyacid.oxysome(biology) One of the small round bodies found in the folds of the cristae in the inner mitochondrial membrane, and involved in ATP synthesis.oxytone(linguistics, of a word) Having the stress on the last syllable.oxyurid(zoology) Any of the order Oxyurida of nematode worms.oxyweldTo weld using oxyfuel.oyakata(sumo) A retired rikishi who has reached a certain standing and either becomes a shisho or helps train in others' heya.oyelite(mineralogy) An orthorhombic white mineral containing boron, calcium, hydrogen, oxygen, and silicon.oystersplural of oysteroystery(possibly dated) A fishery for oysters; a place where oysters are kept and grown.ozadene(anatomy) A defensive gland present in some arthropods, which secretes a foul-smelling substance to discourage predators.ozagrel(pharmacology) An antiplatelet agent that works as a thromboxane A2 synthesis inhibitor.ozonateTo treat or react with ozone; to ozonize.ozonide(chemistry) the univalent anion, O₃⁻, derived from ozoneozonifyTo treat or react with ozone.ozoniseAlternative spelling of ozonize.ozonium(mycology) A carpet of hyphae, resembling an above-ground mycelium, associated with certain mushrooms of the genus Coprinellus.ozonizeTo treat or react with ozone; to ozonateozonousArchaic form of ozonic.ozopore(anatomy) The opening of a defensive gland present in some arthropods, which secretes a foul-smelling substance to discourage predators.
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