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obelisklikeResembling an obelisk.obetriosideA particular steroid glycoside.obfusticateSynonym of obfuscate.objectivate(transitive) To objectify.objectiviseAlternative form of objectivize.objectivize(transitive) To objectify.objurgativeThat objurgates; sharply disapproving.obliterableCapable of being obliterated.oblivionate(transitive) To send to oblivion; to destroy or eliminate.oblivionize(transitive) To consign to oblivion; to destroy or erase utterly.obpandurate(botany, of leaves) Having a reverse pandurate shape, with the sinuosity toward the apex and the broadest part toward the base.obsagittate(botany, of leaves) Of a reverse sagittate shape, with two pointed lobes extending at the apex.obscurativeTending to obscure; making something unclear or abstruse.obsequienceobsequiousnessobservativeobservant; watchfulobservaunceObsolete form of observance.obstinative(obsolete) obstinateobstractiveMisspelling of obstructive.obstructiveCausing obstructions.obtemperate(transitive, Scotland after the 17th century) To obey, comply or submit to. [with direct object]obturbinateinversely top-shapedocaperidone(pharmacology) An antipsychotic drug.occasionate(transitive, obsolete) To occasion.oceanophyte(biology) an oceanic plant or plant life which exists in oceansocriflavine(dated, biochemistry) flavinoctaacetate(organic chemistry) Any compound that has eight acetate groups (typically of a sugar)octabenzoneAn ultraviolet absorber/screener, used to protect polymers against damage by UV light.octabromide(chemistry) any bromide containing eight bromine atoms in each moleculeoctacontane(organic chemistry) Any saturated aliphatic hydrocarbon that has 80 carbon atoms, but especially n-octacontaneoctadentate(chemistry) Of a ligand, capable of forming eight separate chemical bonds to a coordinating metal ionoctahedrane(organic chemistry) A hypothetical paddlane derivative, in the form of an octahedron, that would be an allotrope of carbonoctahedrite(mineralogy) The mineral anatase.octahydrate(chemistry) A hydrate whose solid contains eight molecules of water of crystallization per molecule, or per unit cell.octanedione(organic chemistry) Any of several isomeric diketones, derived from octane, that are used as intermediates in organic synthesisoctanoylate(organic chemistry) To cause or to undergo octanoylationoctapartitedivided into eight partsoctapeptideAn oligopeptide having eight amino acids.octasulfane(inorganic chemistry) The binary compound of hydrogen and sulfur H₂S₈octasulfate(chemistry) Any compound that has eight sulfate groups or ionsoctatropine(pharmacology) A muscarinic antagonist and antispasmodic, used in the methylbromide form.octhilinoneA particular fungicide.octocrylene(organic chemistry) An ester formed by the condensation of a diphenylcyanoacrylate with 2-ethylhexanol, used in sunscreens and cosmetics.octodentate(rare) Having eight teeth.octodontineRelating to, or characteristic of the octodontidsoctopartiteHaving eight parts.octopeptideMisspelling of octapeptide.octopuslikeResembling or characteristic of an octopus, for example in having eight (or many) arms.octoradiateHaving eight rays.octotiamineA particular thiamine analog.octuplicateA set of eight like or identical things.oculocentreA reference point in the centre of each eyeodintsovite(mineralogy) An orthorhombic-dipyramidal mineral containing beryllium, calcium, oxygen, potassium, silicon, sodium, and titanium.odontophoreA projection in the mouths of most molluscs, used with the radula to break up food.odontoscopeAn instrument for testing the action of gear wheels.odontostyle(anatomy) A protrusible, hollow, needle-like tooth found in nematodes, used to puncture and empty food items.oecophorineOf or pertaining to the moth tribe Oecophorinae.oenoculture(rare) The cultivation of grapes to produce wine; viniculture.officerlikeResembling, characteristic of, or befitting an officer.officescapeThe landscape within an office; a landscape of offices.officialateA diocesan tribunal.officialeseThe typical language of officials or official documents; legalistic and pompous language.officialiseAlternative spelling of officialize.officialize(transitive) To make official.offlineable(Internet, software, very rare) Capable of being used offline to some degree.offsettableCapable of being offset.offshorableCapable of being offshored.okanoganite(mineralogy) a trigonal rare earth fluoro borosilicate mineral.okayamalite(mineralogy) A tetragonal-scalenohedral creamy white mineral containing boron, calcium, oxygen, and silicon.oleanitrile(organic chemistry) The nitrile formally derived from oleic acid by replacement of the -COOH group by -CNoleicultureThe agricultural production of oils.olfactoriseBritish standard spelling of olfactorize.olfactorizeTo form a mental representation of what something smells like.oliceridineAn opioid drug for the treatment of acute pain.oligarchise(transitive) To make oligarchic.oligarchize(transitive, politics) To make (a political system) oligarchic.oligochaeteAny of various hermaphroditic aquatic and terrestrial annelid worms, of the subclass Oligochaeta, that have single bristles along the body.oligochrome(art) Using only a few colours.oligohalineContaining little salt.oligolysineAn oligomer of lysineoligomerase(biochemistry) Any enzyme that catalyses the hydrolysis of an oligomeroligomeriseAlternative form of oligomerize.oligomerize(chemistry, intransitive) To react together to form an oligomer.oligopolize(transitive) To convert a market into an oligopoly.oligopurine(genetics) A stretch of nucleic acid composed of several contiguous purinesoligosalineOf a body of water, of low salinity.oligosilane(organic chemistry) Any polysilane with a relatively low number of silane unitsoligosphereA homotypic aggregate of oligodendrocyte progenitorsolitorisideA particular steroid glycoside.olkhonskite(mineralogy) A monoclinic black mineral containing chromium, oxygen, titanium, and vanadium.olmsteadite(mineralogy) An orthorhombic-pyramidal mineral containing hydrogen, iron, niobium, oxygen, phosphorus, potassium, and tantalum.olopatadine(organic chemistry, pharmacology) A particular antihistamine used in eye drops to treat allergic conjunctivitis.olpadronate(pharmacology) The conjugate base, or any salt or ester, of olpadronic acid. Used as a medication to inhibit bone loss in disorders of bone metabolism.olsacherite(mineralogy) An orthorhombic-disphenoidal colorless mineral containing lead, oxygen, selenium, and sulfur.omacetaxineA protein translation inhibitor drug for the management of treatment-resistant chronic myeloid leukemia and under investigation for some other hematologic cancers.omiloxetine(pharmacology) An antidepressant.omniabsenceThe property of being omniabsent.omnieruditeErudite in all subjects; polymathic.omnificenceThe state of being omnificent.omnipotenceUnlimited power; commonly attributed to a deity or deities.omniscienceThe capacity to know everything.omnividenceThe quality of being all-seeing.omoconazole(pharmacology) A particular azole antifungal drug.omphaloceleA hernia of the navel.onapristone(pharmacology) A synthetic antiprogestogen used to combat prostate cancer.onchosphereAlternative form of oncosphere.oncohistoneA mutated oncogenic histoneoncopeptideA peptide that is associated with a particular canceroncovaccine(medicine) A vaccine for a cancer.oneirocriteOne skilled in oneirocrisy; an interpreter of dreams.opacifiableCapable of being made opaque.opalescencethe state of being opalescentopeidoscopeAn instrument, consisting of a tube with one end open and the other end covered with a thin flexible membrane with a mirror attached to its centre, used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds that enter the tube.ophicalcite(mineralogy) ophite; verd antiqueophrynopineRelating to sawflies of the genus Ophrynopusophthalmate(biochemistry) Any salt of ophthalmic acidophthalmite(zoology) An eyestalk.opinionableBeing a matter of opinion; not positively settled.opinionaire(dated) opinion pollopisthodome(architecture) Alternative spelling of opisthodomos.oppignerate(transitive) Alternative form of oppignorate. [with 1622-1857]oppignorate(transitive, obsolete) To pawn; to lay in pledge.oppressibleAble to be oppressed.opprobriateTo express opprobrium for or to view with opprobrium; to scorn.opsonizableAble to be opsonized.optimisable(British) Alternative spelling of optimizable.optimizableCapable of being optimized.optionaliseAlternative form of optionalize.optionalizeTo make optional; to add as an option, permit to be optionally omitted, or provide various options for implementing.orchardlikeResembling or characteristic of an orchard.orchestrate(transitive) To arrange or score music for performance by an orchestra.ordinariateThe office of a Roman Catholic ordinary, especially a bishop.orecchietteA type of pasta, made with the thumb from a small disk, typically from Puglia.organisableAlternative form of organizable.organizableAble to be organizedorientaliseNon-Oxford British English standard spelling of orientalize: Alternative letter-case form of Orientalize.orientalizeAlternative letter-case form of Orientalize.orientativeServing to orient or orientate.originativeThat originates; creativeornitholite(paleontology) The fossil remains of a bird.ornithurineA bird of the clade Ornithurae.orotidylate(organic chemistry) orotidine 5'-phosphateoroxyloside(organic chemistry) Any glycoside of an oroxylinorschallite(mineralogy) A trigonal-hexagonal scalenohedral colorless mineral containing calcium, hydrogen, oxygen, and sulfur.orsellinate(organic chemistry) Any salt or ester of orsellinic acid.orthoborate(inorganic chemistry) Any anion derived from orthoboric acid; any salt containing this anionorthocentreAlternative form of orthocenter.orthodoxiseAlternative form of orthodoxize.orthodoxize(transitive) To render something or someone orthodox.orthoxylene(organic chemistry) An aromatic hydrocarbon based on benzene with two methyl substituents bonded to adjacent carbon atoms in the aromatic ring (the ortho configuration).oscillativeTending to oscillate; oscillatory, oscillating.osotriazole(chemistry) any 1,2,3-triazole formed by oxidation of an osazoneostentativeSynonym of ostentatious.osteochrome(cytology) Any substance that stains bone tissueosteoimmuneRelating to the skeletal and the immune systemsosteosutureA surgery in which fragments of broken bone are sutured together.osteotomize(surgery) To perform an osteotomyostreaphileAn lover or aficionado of oysters as food.ostreophage(rare) Synonym of ostreophagist.ostrichlikeResembling or characteristic of an ostrich; struthianotherwhence(formal, now rare) By other means; From otherwhere.otjisumeite(mineralogy) A triclinic mineral containing germanium, lead, and oxygen.ottemannite(mineralogy) An orthorhombic-dipyramidal reddish gray mineral containing sulfur and tin.ottomanlikeResembling or characteristic of an ottoman (furniture).outdistance(transitive) To run farther or faster than another, or to finish a race with a large margin.outerchange(British, chiefly London, rail transport) A connection between two stations within walking distance of each other but which are not physically connected; used especially where a journey involving such a connection can be done on a single ticket.outercourseSexual activity without vaginal or anal penetration.outexercise(transitive) To exercise more or better than.outintrigue(transitive) To surpass in plots or intrigues.outlitigate(transitive) To defeat in litigation.outmaneuvreNonstandard spelling of outmaneuver.outmarriageMarrying outside one’s own ethnic, religious, or social group.outorganize(transitive) To organize oneself better than.outpopulate(transitive) To surpass in population; to outnumber.outpurchase(transitive) To purchase more than.overachieveTo achieve more or at a higher level of quality than was expected.overagitateTo agitate excessively.overagonize(intransitive) To agonize excessively.overanalyseAlternative spelling of overanalyze.overanalyze(transitive) To analyze too much or in too much detail.overanimate(transitive) To animate excessively.overarrange(transitive) To arrange excessively or too precisely.overbalanceTo be more important than; to outweigh.overbreathe(intransitive) To hyperventilate.overclosure(dentistry) Quality or degree of being overclosed.overcomableAlternative form of overcomeable.overconsumeTo consume too much.overcultureThe dominant culture in a society, whose mores, traditions, and customs are those normally followed in public, as opposed to a subculture.overdentureA type of dental prosthesis that is not permanently fixed in place, but can be disconnected from the implant abutments with finger pressure by the wearer.overdiffuseExcessively diffuse.overdiurese(ambitransitive) To cause or undergo overdiuresis.overdiverseExcessively diverse.overdribble(basketball) To dribble the ball excessively.overeducateTo educate too much.overelianceMisspelling of overreliance.overembrace(transitive) to embrace too often or to an excessive degreeoveremotiveExcessively emotive.overenforce(transitive) To enforce excessively.overfatigue(transitive) To fatigue to excess; to tire out.overfeature(transitive) To feature excessively.overfinance(transitive) To finance too much.overgestureTo gesture excessively.overhydrate(ambitransitive) To hydrate too much.overimagine(transitive) To imagine with excessively elaborate detail, or in an exaggerated fashion.overimitate(transitive) To imitate excessively.overindulge(ambitransitive) To indulge to excess.overinflateTo inflate excessively; to provide too much inflationoverintenseExcessively intense.overmassive(astronomy) Of a star: having a greater mass than is typical for its type.overmeasureTo measure or estimate with a result that is larger than it should be.overmigrateTo migrate excessivelyoveroperateTo perform too many surgical operations.overpackage(transitive) To package wastefully in more material than necessary.overpensiveExcessively pensive.overperfumeTo perfume excessively.overpicture(transitive, obsolete) To surpass nature in the picture or representation of; describe or portray with exaggeration.overplusageOverplus; excess.overpreciseExcessively precise; more accurate than is needed.overprepare(transitive) To prepare excessively; to make ready more than is necessary for a specific future purpose.overproduceTo produce more of something than one can use or sell.overpromiseTo promise more than is delivered.overpromote(transitive) To promote excessively.overpronateTo pronate to an excessive degree.overprovokeTo provoke excessively.overreplaceTo replace in excessoverrepleteExcessively replete.overreserve(finance, intransitive) To put an excessive amount of money in reserve.overrestore(transitive) To impair (an old artwork, building, etc.) by restoring it too enthusiastically.overridableThat can be overridden.overrulableThat can be overruled.oversecrete(medicine) to secrete excessivelyoverseeableThat can easily be looked over.overservice(transitive) To provide with excessive service.overservileExcessively servile.oversincereExcessively sincere.overstowageThe act of overstowing.oversublimeExcessively sublime.oversubtileObsolete form of oversubtle.overtakableThat can be overtakenovertillageexcessive tillage; the process of overtillingovertrample(transitive) To trample over.overutiliseAlternative form of overutilize.overutilizeTo utilize excessivelyoververboseExcessively verbose or wordy.overvoltageThe hazardous condition that occurs when the voltage in a circuit is raised above that for which it was designed.overwrestle(transitive, archaic) To defeat or overcome by wrestling.oxacilinaseMisspelling of oxacillinase.oxalacetateAlternative form of oxaloacetate.oxalomalate(organic chemistry) Any salt or ester of oxalomalic acidoxaluramide(organic chemistry) oxalanoxamniquine(pharmacology) An anthelmintic drug with schistosomicidal activity against Schistosoma mansoni.oxandrolone(pharmacology) An androgenic anabolic steroid C₁₉H₃₀O₃ administered orally especially to promote weight gain (as after extensive surgery or a chronic infection) and to relieve bone pain in osteoporosis.oxasilolane(organic chemistry) A saturated five-membered heterocycle having three carbon atoms, one silicon and one oxygen atom; any of its derivativesoxathiazine(organic chemistry) A six-membered unsaturated heterocycle containing three carbon atoms and one each of nitrogen, oxygen and sulfuroxathiazole(organic chemistry) The unsaturated five-membered heterocycle having two carbon atoms, one oxygen atom, one sulfur atom, one nitrogen atom and one double bondoxathiirane(organic chemistry) A saturated three-membered heterocycle containing one carbon, one sulfur and one oxygen atomsoxathiolane(organic chemistry) A five-membered saturated heterocycle having a three carbon atoms, one oxygen atom and one sulfur atomoxatriazole(organic chemistry) Any five-membered heterocycle having one carbon atom, three nitrogen atoms, one oxygen atom, and two double bondsoxatricycle(organic chemistry) Any tricyclic heterocycle containing oxygen as a heteroatomoxaziridine(organic chemistry) A three-membered saturated heterocycle having one carbon, one nitrogen and one oxygen atomsoxazolidine(organic chemistry) A saturated heterocycle containing three carbon atoms and one nitrogen and one oxygen atom; any of its derivatives.oxazolidoneAlternative form of oxazolidinone.oxdralazine(pharmacology) A vasodilator.oxethazaineSynonym of oxetacaine.oxfendazoleA certain anthelmintic drug.oxiconazole(pharmacology) A particular antifungal medication.oxidopamine(neurotoxicology, pharmacology) A neurotoxin used by scientists for selective killing of dopaminergic and noradrenergic neurons.oxiperomideAn antiparkinsonian drug.oxoaldehyde(organic chemistry) Any aldehyde that also has an oxo/ketone group.oxochloride(chemistry) Any oxohalide in which the halide is chlorideoxofluoride(chemistry) Any oxohalide in which the halide is fluorideoxomemazineA particular antihistamine drug.oxometalateAlternative spelling of oxometallate.oxopantoate(organic chemistry) A chemical derivative of pantoate where an oxygen is doubly bonded to form a ketone.oxopnictideAlternative form of oxypnictide.oxovanadate(inorganic chemistry) Any of several vanadate derivatives that have an extra oxygen atomoxyarsenide(inorganic chemistry) An oxypnictide in which the pnictogen is arsenic.oxybenzoate(organic chemistry) A ketone derived from benzoate: A salt or ester derived from 6-oxo-2,4-cyclohexadiene-1-carboxylic acidoxychloride(inorganic chemistry) A ternary compound of oxygen and chlorine.oxyethylene(organic chemistry, especially in combination) ethylene oxide, oxiraneoxyfluoride(inorganic chemistry) A ternary compound of oxygen and fluorine.oxymorphineAlternative form of oxymorphone.oxymorphone(pharmacology) A particular narcotic painkiller.oxypnictide(chemistry) Any substance that is both an oxide and a pnictide, especially any of a class of such iron compounds that are semiconductorsoxyselenide(inorganic chemistry) a mixed oxide and selenideoxystelmineA particular steroid glycoside.oxysulphateAlternative form of oxysulfate.oxysulphideAlternative form of oxysulfide.oxythiamineThe thiamine antagonist cation 5-(2-hydroxyethyl)-3-(4-hydroxy-2-methyl-5-pyrimidinylmethyl)-4-methylthiazoliumozonosphereA layer in part of the stratosphere that has a larger than normal concentration of ozone; the ozone layer.