Other Ending Letters

Word Lengths Starting With O

All 429 Matching Words

oafdomThe state or condition of an oaf; oafishness.oakumCoarse fibres separated by hackling from flax or hemp when preparing the latter for spinning.obcordiformInversely cordiform; obcordate.obeahismAlternative form of obiism.obeismAlternative form of obiism.obelism(rare) The practice of annotating manuscripts with marks set in the margins.obeseismdiscrimination against very fat peopleobfirm(transitive, obsolete) To make firm or stubborn.obiismBelief in, or the practice of, the obeah superstitions and rites.objectionismA policy of objecting to something; opposition.objectismAn approach to poetry in which the poet is regarded as just one object among the other objects in existence, rather than a subject through which they are mediated.objectivismThe state of being objective; objectivity.oblatum(geometry) An oblate spheroid; a figure described by the revolution of an ellipse about its minor axis.obligatum(logic) That which is, or must be, granted.obliterationismA policy of obliteration.oblongum(geometry, archaic) A prolate spheroid; a figure described by the revolution of an ellipse about its greater axis.obpyriform(botany) Having a shape that is in outline like that of a pear, with the base at the narrower end.obreniform(botany, of leaves) Having a reverse reniform shape, with the petiole opposite the notch.obscurantismA state of opposition to human progress or enlightenment.obscurationismThe policy of obscuration.observandumA thing to be observed.observationalismThe philosophical approach that derives knowledge from observations.observatorium(archaic or non-native speakers' English) An observatory.obsessionalismobsessive behaviourobsessionismObsessiveness.obsoletismA disused word or phrase; an archaism.obstructionismA deliberate policy of obstructing something, especially a political process or body.obstructivismA tendency to obstruct the activities of others.obtrapeziform(botany, of a leaf) trapeziform, but attached by the narrower trapezoidal baseobturaculumA plug of connective tissue separating the hemocoels of the head and thorax of some liceoccasionalism(philosophy, uncountable) A metaphysical doctrine that holds that all events are occasioned (caused) by God.occhiolism(neologism, rare) The awareness of the small scope of one's own perspective and the way it limits one's ability to fully understand the world.occidentalismThe habits and attitudes of westerners.occidentotropismAn expression (sometimes a figure of speech) with an inclination toward western civilization (i.e. the occident).occulariumAlternative form of ocularium.occultism(philosophy) The study of the supernaturaloccupationismCollaborationism.oceanariumA park where visitors can see marine mammals and/or fish.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.ochemAlternative form of O-chem.ockerdomThe world or sphere of ockers (boorish, uncultivated Australians).ockerism(Australia) The manners or habits of ockers.octacalcium(inorganic chemistry, in combination) Eight calcium atoms or ions in a compoundoctadrachm(historical) An Ancient Greek coin having a value of eight drachmas.octagramAn eight-sided star polygon.octamerismThe condition of being octamerousoctapalladium(chemistry, in combination) Eight palladium atoms or cations in a molecule (Pd₈)octarhodium(chemistry, in combination) Eight rhodium atoms or cations in a molecule (Rh₈)octasodium(chemistry, in combination) Eight sodium atoms or cations in a moleculeoctennium(rare) An eight-year period.octetonium(physics) A color singlet bound state of color-octet scalars.octium(chemistry) The element oxygen.octocalciumMisspelling of octacalcium.octogenarianismThe state or condition of being an octogenarian.octogram(geometry) A regular eight-pointed star shape.octopodiformA cephalopod of the superorder Octopodiformes, comprising octopuses and vampire squid.octylammonium(organic chemistry) The univalent cation obtained by protonation of octylamine CH₃(CH₂)₇NH₃⁺ocularcentrismThe privileging of vision over the other senses.oculariumA slit in a helmet through which the wearer could see.oculiformHaving the shape of an eyeoculismophthalmology; optometryodalism(historical) A system of heritable freehold property rights to odal land.odditoriumA shop or museum exhibiting unusual curiosities.odeumAlternative form of odeon.odism(archaic) The supposed science of the force or natural power called od.odiumHatred; dislike.odontoglossumAny of very many orchids of the genus Odontoglossum.odontogram(dentistry) A diagrammatic representation of a person's teethodonymAn identifying name given to a street; a street name.odoomAlternative form of odum (“the tree Milicia excelsa”).odumSynonym of mvule ("a tree of species Milicia excelsa")odylism(pseudoscience, historical) A belief in a vital force known as od or odyle.oecium(zoology) The household common to the individuals of a compound organism.oeconymUncommon spelling of oikonym.oecumenicalismAlternative spelling of ecumenicalism.oecumenicismAlternative form of ecumenicism.oedipism(medicine) Self-infliction of injury to the eye, especially enucleation.oenogarumgarum diluted with wineoenotourismAlternative form of enotourism (“wine tourism”).oesophagogramAlternative form of esophagogram.oesophagospasmAlternative form of esophagospasm.oestrogenismAlternative form of estrogenism.oestrum(figurative, now rare) Something that stings or incites one to frenzy or action; an impulse or passion.officerismThe attitudes and behaviour of an officer.officialdomThe people elected to government or employed in the civil service.officialismThe rigid, perfunctory and literal adherence to official duties and regulationsoffstreamNot located on a streambed.ogamAlternative spelling of Ogham.ogreism(archaic) The character or manners of an ogre.ohmIn the International System of Units, the derived unit of electrical resistance; the electrical resistance of a device across which a potential difference of one volt causes a current of one ampere.oidiumA fragile spore produced by some fungi.oikonymA type of toponym denoting a settlement or its part.oilpalmAlternative form of oil palm.olamAlternative form of ollamholeicum(obsolete, organic chemistry) oleic acid, (an organic acid prepared from fatals, appearing as a yellowish liquid), used to form oleatesoleocystidium(mycology) A cystidium which is leaking an oily substance.oleosaccharumAn oil-sugar; a preparation made by saturating thirty grains of sugar with one drop of volatile oil.oleum(inorganic chemistry) A solution of sulfur trioxide in sulfuric acid.olibanumA gum resin from trees of the genus Boswellia, formerly used as a medicine and now mainly as incense.oligarchismThe principles or spirit of an oligarchy.oligophagismSynonym of oligophagy.oligopolismAny doctrine supporting an oligopoly.oligospermatismSynonym of oligospermia.oligosyndactylismSynonym of oligosyndactyly.olimplural of olehollamAlternative form of ollamh.olmProteus anguinus, a cave-dwelling neotenous salamander with external gills, found along the coast from northeastern Italy to Montenegro.olusatrum(archaic) An umbelliferous plant, the common alexanders, found in Western Europe (Smyrnium olusatrum).om(Hinduism, Buddhism) A sacred, mystical syllable used in prayer and meditation.omalodontiform(of teeth) Having a denticulate form characteristic of the order Omalodontiformesomasum(biology, food) The third compartment of the stomach of a ruminant; the lining of said compartment, regarded as a foodstuff.omegaformIn the shape of the letter omega.omentum(anatomy) Either of two folds of the peritoneum that support the viscera.ommateum(zoology, archaic) A compound eye, found on, for example, insects and crustaceans.ommatidium(zoology) One of the conical substructures which make up the eyes of invertebrates with compound eyes.omniformHaving every form or shape.omnigatherumomnium-gatherumomnismThe recognition and respect of all religions.omnitheism(religion) The belief that all religions contain a core recognition of the same god or gods.omnium(finance) The aggregate value of the different stocks in which a loan to government is usually funded.omnomnomAlternative form of om nom nom.omoideumThe pterygoid bone.omomyiformAny primate of the infraorder Omomyiformesomosternum(anatomy) In many mammals, an interarticular cartilage, or bone, between the sternum and the clavicle.omphalismA tendency to place the capital of a country at its geographical centre, or to increase the powers of central government at the expense of local government.omphalodiumAlternative form of omphalode.onanismMasturbation.onbeam(neurophysiology) In line with excited parallel neurofibers.onchomAlternative form of oncom.oncidium(botany) Any of the genus Oncidium of tropical orchidaceous plants.oncomA traditional staple food of West Javan (Sundanese) cuisine in Indonesia, similar to tempeh, and usually made from the by-products from the production of other foods.oncomiracidiumThe free-swimming, ciliated larval form of a monogenean.oncotropismThe condition of being oncotropicondogramThe recording produced by an ondograph.oneirism(psychiatry) A state of abnormal consciousness in which dream-like experiences and hallucinations happen while awake.oneirocriticismdream interpretationonisciform(of an insect larva) flattened and broad in formonium(chemistry) Any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families.onopordum(botany) Any of the genus Onopordum of asteraceous thistles.onstreamBeing producedontogramA graphical representation of an ontology (branch of knowledge)ontologism(philosophy) An ideological system which maintains that God and divine ideas are the first object of our intelligence and the intuition of God's existence the first act of our intellect.ooeciumAn ovicell of a bryozoan.oogonium(biology) An immature ovarian egg within a developing fetus.oogramAn image, typically of parasite eggs, produced by oographyoom(South Africa) An older man, especially an uncle. (Frequently as a respectful form of address.)oophoridium(botany, obsolete) The macrosporangium or case for the larger kind of spore in heterosporous flowerless plants.ooplasmThe cytoplasm of an egg or ovumoosperm(biology) The ovum, after fusion with the spermatozoon in impregnation.oosporangium(botany) An oogonium.operationalism(sciences) A philosophy that attempts to define all scientific concepts in terms of specified operations or procedures of observation and measurement.operationism(philosophy) The doctrine that the meaning of a term consists of the operation(s) performed in defining itoperculiform(botany, zoology) Having the form of a lid or cover.operculum(zoology) A covering flap in animals, such as a gill cover.ophanimplural of ophanophidiariumA place for keeping snakes.ophidiiform(zoology) Any ray-finned fish of the order OphidiiformesophidismPoisoning by snake venom.ophthalmospasm(pathology) A sudden involuntary contraction of the eyeballopisthobranchism(zoology, rare) The property of being an opisthobranch.opisthocomiformAny bird of the order Opisthocomiformesopium(by extension, countable) Anything that numbs or stupefies.opiumism(dated) Opium addiction.opobalsam(medicine, obsolete) The aromatic resinous juice of Commiphora opobalsamum (balm of Gilead).opobalsamumSynonym of opobalsam.opossumAny American marsupial of the family Didelphidae in the order Didelphimorphia.oppidumA large, defended Iron Age settlement associated with the Celtic La Tène culture.opportunismThe practice of taking advantage of any situations or people to achieve an end, often with no regard for principles or consequences.oppositionismA policy of opposition (principally in politics)opposumMisspelling of opossum.oppressionismSynonym of oppression.opprobrium(countable, archaic) A cause, object, or situation of disgrace or shame.optimalism(philosophy) The doctrine that this universe exists because it is better than the alternatives.optimisma tendency to expect the best, or at least, a favourable outcomeoptimumThe best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.optogram(physiology) An image of external objects fixed on the retina by the photochemical action of light on rhodopsi.opusculumAn opuscule; a short work.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.orangeblossomUncommon form of orange blossom.orangewormA snout moth of the genus Amyelois that is a pest to some commercial cropsorarium(religion) A collection of private devotions.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.orbuculum(paganism) A crystal ball.orchidariumAn orchid garden.orchideliriumSynonym of orchidomania.ordalium(obsolete) Trial by ordeal.ordinalismThe state or quality of being ordinal.ordoliberalism(economics, politics) A political philosophy that emphasizes the desirability of the government establishing rules to maximize the potential of the free market to produce results.organicism(medicine, historical) The theory that disease is a result of structural alteration of organs.organigram(management) A graphical representation of the structure of an organization, showing groups and departments and their interconnections and linked responsibilities.organism(biology) A discrete and complete living thing, such as animal, plant, fungus or microorganism.organistrum(music) Any early form of hurdy-gurdy.organoaluminium(organic chemistry) Describing any organic compound containing a carbon to aluminium bondorganoaluminumAlternative spelling of organoaluminium.organobarium(organic chemistry) Describing any organic compound containing a carbon-to-barium bond.organocadmium(organic chemistry) Describing any organic compound containing a carbon to cadmium bondorganocaesiumAlternative form of organocesium.organocalcium(organic chemistry) Describing any organic compound containing a carbon to calcium bond.organocerium(organic chemistry) Describing any organic compound containing a carbon to cerium bond.organocesium(organic chemistry) Describing any organic compound containing a carbon to cesium bond.organochromium(organic chemistry) Describing any organic compound containing a carbon to chromium bond.organodysprosium(organic chemistry) Describing any organic compound containing a carbon to dysprosium bond.organoerbium(organic chemistry) Describing any organic compound containing a carbon to erbium bond.organoeuropium(organic chemistry) Describing any organic compound containing a carbon to europium bond.organofleroviumDescribing any organic derivative of flerovium, especially one that has a carbon-flerovium bondorganogallium(organic chemistry) Describing any organic compound containing a carbon-to-gallium bond.organogermanium(organic chemistry) Describing any organic compound containing a carbon to germanium bondorganogram(management) Alternative spelling of organigram.organohafnium(organic chemistry) Describing any organic compound containing a carbon-to-hafnium bond.organoindium(organic chemistry) Describing any organic compound containing a carbon-to-indium bond.organoiridium(organic chemistry) Describing any organic compound containing a carbon to iridium bond.organolanthanum(organic chemistry) Describing any organic compound containing a carbon to lanthanum bond.organolithium(organic chemistry) Describing any organic compound containing a carbon to lithium bond.organolutetium(organic chemistry) Describing any organic compound containing a carbon to lutetium bond.organomagnesium(organic chemistry) Describing any organic compound containing a carbon to magnesium bondorganomolybdenum(organic chemistry) Describing any organic compound containing a carbon to molybdenum bond.organoneodymium(organic chemistry) Describing any organic compound containing a carbon to neodymium bond.organoniobium(organic chemistry) Describing any organic compound containing a carbon to niobium bond.organoosmium(organic chemistry) Describing any organic compound containing a carbon-to-osmium bond.organopalladium(organic chemistry) Describing any organic compound containing a carbon to palladium bondorganoplatinum(organic chemistry) Describing any organic compound containing a carbon-to-platinum bond.organoplutonium(organic chemistry) Describing any organic compound containing a carbon to plutonium bond.organopolonium(organic chemistry) Describing any organic compound containing a carbon to polonium bond.organopotassium(organic chemistry) Describing any organic compound containing a carbon to potassium bond.organorhenium(organic chemistry) Describing any organic compound containing a carbon to rhenium bond.organorhodium(organic chemistry) Describing any organic compound containing a carbon-to-rhodium bond.organorubidium(organic chemistry) Describing any organic compound containing a carbon to rubidium bond.organoruthenium(organic chemistry) Describing any organic compound containing a carbon to ruthenium bondorganosamarium(organic chemistry) Describing any organic compound containing a carbon to samarium bond.organoscandium(organic chemistry) Describing any organic compound containing a carbon to scandium bond.organoselenium(organic chemistry) describing any of a series of derivatives of selenium that have at least one alkyl or aryl group, especially one containing at least one carbon-selenium bondorganosodium(organic chemistry) Describing any organic compound containing a carbon to sodium bond.organostrontium(organic chemistry) Describing any organic compound containing a carbon-to-strontium bond.organotantalum(organic chemistry) Describing any organic compound containing a carbon to tantalum bond.organotechnetium(organic chemistry) Describing any organic compound containing a carbon-to-technetium bond.organotellurium(organic chemistry) Describing any organic compound containing a carbon to tellurium bond.organothallium(organic chemistry) Describing any organic compound containing a carbon to thallium bond.organothorium(organic chemistry) Describing any organic compound containing a carbon to thorium bond.organotitanium(organic chemistry) Describing any organic compound containing a carbon to titanium bondorganotropismThe affinity of certain substances, or of certain microorganisms, for particular tissues or organs.organouranium(organic chemistry) Describing any organic compound containing a carbon-to-uranium bond.organovanadium(organic chemistry) Describing any organic compound containing a carbon to vanadium bond.organoytterbium(organic chemistry) Describing any organic compound containing a carbon to ytterbium bond.organoyttrium(organic chemistry) Describing any organic compound containing a carbon to yttrium bond.organozirconium(organic chemistry) Describing any organic compound containing a carbon to zirconium bond.organum(music) A type of medieval polyphony which builds upon an existing plainsong.orgasmA creamy white alcoholic cocktail containing amaretto, Irish cream, and coffee liqueur.orgiasticismWild, uncontrolled behaviour (especially sexual), like that of an orgy.orichalchumAlternative spelling of orichalcum.orichalcumA valuable yellow metal known to the Ancient Greeks and Romans; now sometimes interpreted as referring to a natural alloy of gold and copper, and sometimes treated as a mythical substance.orientalism(countable) An Eastern word, expression, or custom.origanumAny herbaceous plant of the genus OriganumoriginalismThe view that a text should be interpreted according to the intent of its original authors.ormetoprim(pharmacology) A dihydrofolate reductase inhibitor.ornamentalismAny artistic or architectural style characterised by ornamentation.ornithogalum(botany) Any plant of the genus Ornithogalum.ornithonymThe common name of a (species of) bird.oronymThe toponym of a mountain.orphanarium(rare, chiefly humorous) An orphanage.orphandomThe state of being an orphan.orphanismThe state of being an orphan.orphanotrophism(dated, rare) The care and support of orphans.orphanotrophium(historical) A kind of orphanage in ancient times.orthocharmonium(particle physics) The form of charmonium in which the spins of the two quarks are parallel.orthochromatismQuality of being orthochromatic.orthodiagramThe record made by an orthodiagraph.orthodoxism(religion) Strict orthodoxy.orthoform(dated) A former anaesthetic.orthognathism(anatomy) The quality of being orthognathous.orthogoniumright-angled triangleorthogravitropism(botany) The normal tendency of a plants parts to bend downward under the effects of gravityorthomorphism(mathematics) A morphism that is also a permutationorthonymThe real name of a person who uses a pseudonym.orthopantomogramA panoramic radiograph of the whole mouth, including the jaws and teeth.orthopentamogramMisspelling of orthopantomogram.orthophemismAn orthophemistic term, one that is neither euphemism nor dysphemism.orthopositronium(physics, attributive) The state of a positronium exotic atom in which the positron and electron have parallel spinsorthoquarkonium(particle physics) A form of quarkonium where the spins of the constituent quarks are parallel.orthoroentgenogram(medicine) A radiograph produced by orthoroentgenography.orthostatism(uncommon) Synonym of orthostasis (“an upright standing position”).orthosterism(biology, of a receptor) The condition of being orthostericorthotropismThe property of being orthotropic or orthotropous.oscillogramA record produced by an oscillograph or oscilloscope.osculum(chiefly zoology) A small opening or orifice.osm(Internet slang) awesome; like OK, can be used to express enthusiastic approval.osmateriumAlternative form of osmeterium.osmeriformOf the order Osmeriformes of ray-finned fish, characterised by having the maxilla in the gape of the mouth, radii absent from the scales, and loss of the basisphenoid and orbitosphenoid bones.osmeterium(zoology) One of a pair of scent organs in the larvae of certain swallowtail butterflies.osmiridium(mineralogy) A hard, corrosion-resistant alloy of osmium and iridium, used in pen nibs.osmium(countable) A single atom of this element.osmoconform(biology, of an organism) To maintain its internal salinity such that it is always equal to the surrounding seawaterosmoticum(biology) Any substance that acts to supplement osmotic pressure in a cellosphradium(zoology, anatomy) a sensory organ in certain molluscs, whose main function is believed to test incoming water for silt and other possible food particles.ossiculum(anatomy) An ossicle.ossiform(anatomy, medicine) Resembling bone.ossilegiumThe collection of the bones of a dead person, after decomposition of the soft tissue, for placement in an ossuaryossuariumA charnel house; an ossuary.ostensoriumAn ostensory, or monstrance.osteoanabolismanabolism of bone tissueosteocatabolismThe catabolism of bone tissueosteocranium(anatomy) The bony cranium, as distinguished from the cartilaginous cranium.osteoderm(anatomy) A bony deposit in the dermal layers of the skinosteoglossiformAny fish of the order OsteoglossiformesosteolathyrismA collagen cross-linking deficiency brought on by dietary overreliance on the seeds of plants of the genus Lathyrus, especially Lathyrus sativus, the grass pea.osteolepiform(zoology) Any extinct fish of the order OsteolepiformesosteospermumAny of the genus Osteospermum of subshrubs.osteotrophismMisspelling of osteotropism.osteotropismThe condition of being osteotropicostiumA small opening or orifice, as in a body organ or passage.ostraciiformCharacteristic of boxfish of the family Ostraciidaeostracism(figuratively) Banishment by some general consent.ostracoderm(zoology) Any of the armored jawless fishes of the Paleozoic.ostracum(archaeology) A fragment of pottery.ostreiformResembling an oysterostrichismThe act of hiding, often unsuccessfully, by ducking one's head out of view.otakudomotakus collectivelyotakuismThe obsessive interest of an otaku, especially an interest in anime or manga.otherdom(rare) The state, condition, or existence of others; the tendency toward preferring, serving, or doing for others; selflessness.otoconium(anatomy, medicine) Synonym of otolith.oughtism(informal) The habit of doing things only because one feels that one ought to do them.outarmTo possess or acquire more powerful weapons than one's opponentoutbeam(transitive) To beam more brightly than; to outshine.outbloom(transitive) To surpass in blooms.outblossomTo blossom more beautifully than, or with more flowers than.outcharmTo surpass in charm; to be more charming thanoutdream(transitive) To surpass in dreams or imagination.outform(obsolete) external appearanceoutgleam(transitive) To shine more brightly than.outgloom(transitive, poetic) To be more gloomy than.outlawdomThe state, condition, or jurisdiction of outlaws; lawlessness; outlaws collectively.outlawismThe state of being an outlaw; lawlessness.outperform(transitive) To perform better than something or someone.outprogram(transitive) To surpass in computer programming ability.outscam(informal, transitive) To surpass in scamming.outscream(transitive) To surpass in screaming.outseamThe seam of a trouser up the outside of the leg.outsiderdomThe state or condition of being an outsider.outsiderismThe status or behaviour of outsiders.outsteam(transitive) To travel further or faster by steam power.outstorm(transitive) To exceed in storming (in various senses).outstream(intransitive) To stream outward.outsum(transitive, archaic) To exceed in number or quantity.outswamsimple past of outswimoutswarm(transitive) To swarm in greater numbers than.outswim(transitive) To swim faster, farther or better than.outvenom(transitive) To exceed in venom.ouvrierism(communism) The glorification of manual laborers, often in opposition to the leadership of labor or socialist movements.ovaliformoviform; egg-shapedovarium(archaic) An ovary.overarmThrowing while having the hand above the elbowoverbloom(botany) To produce an excessive amount of flowers or algae.overbrim(transitive) To flow over the brim of; to overflow.overclaim(transitive) To claim too much.overconform(intransitive) To conform to a greater extent than necessary or desirable.overconservatismExcessive conservatism.overcram(transitive) To cram too full; to overstuff.overcriticismExcessive criticism.overdogmatismExcessive dogmatism.overdream(rare) To dream (about) excessively.overemotionalismThe fact of being overemotionaloverenthusiasmExcessive enthusiasm.overesteem(transitive) To esteem too much.overfarm(transitive) To farm too much.overfreedomThe quality of being excessively free.overgloomTo cause gloom on; to make gloomy.overgroom(transitive, sometimes intransitive) To groom excessively.overidealismExcessive idealism.overindividualismExcessive individualism.overinform(transitive) To provide with too much information.overkingdomA unit composed of several kingdoms and presided over by an overking; an empire.overnim(transitive, archaic) To overtake; seize.overoptimismExcessive optimism.overperformTo perform better than expectedoverpessimismExcessive pessimism.overprogram(ambitransitive) To include too much in a program, scheme or schedule.overprotectivism(rare) The qualities, attitudes, and behaviours associated with being overprotective.overramThe incorrect seating of the charge of a firearm in this manner.overrealismExcessive realism.overseamA seam in which the thread is at each stitch passed over the edges sewn together.overseerismAn arrangement in which one person or organization acts as an overseer over another.oversensationalismexcessive sensationalismoversentimentalismoversentimentalityoverskim(transitive) To skim excessively; to remove too much material from, by skimming.oversteamTo steam too much.overstimoverstimulationoverstratumA stratum or layer lying above another.overstreamTo stream or flow over.oversumA whole that is more than the sum of its parts; superaddition.overswamsimple past of overswimoverswarm(transitive) To swarm over; to overrun.overswim(transitive) To swim too fast or too strenuously.overteem(intransitive) To be filled or swarming with something.overtourismExcessive tourism.overtrim(transitive) To trim too much.overuniformToo uniform; not sufficiently varied.overwarmExcessively warm.overwhelmTo engulf, surge over and submerge.ovism(now historical) The belief that the ovum holds all material needed for the development of the embryo.ovolactovegetarianismThe practice of being ovolactovegetarian.ovovegetarianismThe practice of following an ovovegetarian diet.ovoviviparismThe quality of being ovoviviparous.ovulum(anatomy, now rare, historical) An ovum.ovum(cytology, embryology) The female gamete in animals; the egg cell.owldomThe realm or sphere of owls.owlismAffected or pretentious wisdom; pompous dullness; bombast.oxacarbeniumAlternative form of oxocarbenium.oxacephem(organic chemistry) A derivative of cephem in which an oxygen atom has been substituted for sulfur; the basis for a group of antibioticsoxammonium(inorganic chemistry) The cation HO-NH₃⁺oxazepam(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.oxazinium(organic chemistry) A cation derived from an oxazine or related compoundoxazolam(pharmacology) A benzodiazepine drug with anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties.oxazolinium(organic chemistry) Any cation derived from an oxazoleoxazolium(organic chemistry) A cation derived from a oxazoleoxenium(obsolete, chemistry) oxyliumoxicamAny of a class of non-steroidal anti-inflammatory drugs that bind closely to plasma proteins.oximDated form of oxime.oximonamA beta-lactam antibiotic.oxiracetamA nootropic drug of the racetam family.oxoammonium(organic chemistry) Any of a class of cations of general formula RR^'N⁺=Ooxocarbenium(organic chemistry) Any canonical form of a carbocation having the positive charge on an oxygen atomoxonium(inorganic chemistry) Any univalent oxygen cation derived from water, the simplest of which is the hydronium ion (H₃O⁺).oxorhenium(inorganic chemistry, often in combination) A rhenium and oxygen atom bound together as part of a larger ion or complexoxovanadium(inorganic chemistry, especially in combination) The cation VO²⁺oxycalcium(dated) Of, pertaining to, or produced by a combination of calcium (or lime) and oxygenoxycarbenium(organic chemistry) Any cation of general formula R=O⁺-RoxycephalismSynonym of oxycephaly.oxylium(chemistry) Any cation such as H-O⁺ or R-O⁺oxyphotobacteriumAny photobacterium, of the class Oxyphotobacteria, that produces oxygenozonium(mycology) A carpet of hyphae, resembling an above-ground mycelium, associated with certain mushrooms of the genus Coprinellus.