Glossary · Nouns · O
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TermTypeDefinitionClassificationsUpdated
Optical FusionnounMWEthe combining of images from the two eyes to form a single visual perceptverified
Optical IllusionnounMWEan optical phenomenon that results in a false or deceptive visual impressionverified
Optical PyrometernounMWEa pyrometer that uses the color of the light emitted by a hot objectverified
Optical TelescopenounMWEan astronomical telescope designed to collect and record light from cosmic sourcesverified
Optional ModificationnounMWENSA-approved modification not required for universal implementation by all holders of a COMSEC end-item. This class of modification requires all of the engineering/doctrinal control of mandatory modification but is usually not related to security, safety, TEMPEST, or reliability. See Mandatory Modification.ControlRegulatedCUI
Optometristnouna person skilled in testing for defects of vision in order to prescribe corrective glassesverified
Orachnounany of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshesverified
Orachenounany of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshesverified
Oracle of DelphinounMWE(Greek mythology) the oracle at Delphi where a priestess supposedly delivered messages from Apollo to those who sought adviceverified
Oral ContraceptivenounMWEa contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conceptionverified
Oral Contraceptive PillnounMWEa contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conceptionverified
Oral ContractnounMWEan agreement that is not in writing and is not signed by the parties but is a real existing contract that lacks only the formal requirement of a memorandum to render it enforceable in litigationverified
Oral PersonalitynounMWE(psychoanalysis) a personality characterized either by generous optimism or aggressive and ambitious selfishnessverified
Oral PhasenounMWE(psychoanalysis) the first sexual and social stage of an infant's developmentverified
Oral Poliovirus VaccinenounMWEan oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitisverified
Oral StagenounMWE(psychoanalysis) the first sexual and social stage of an infant's developmentverified
Orange FleabanenounMWEmat-forming herb of Turkestan with nearly double orange-yellow flowersverified
Orange GrassnounMWEannual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowersverified
Orange Horseshoe BatnounMWEa common bat of northwestern Australia having orange or yellow furverified
Orange MilkweednounMWEerect perennial of eastern and southern United States having showy orange flowersverified
Orange MilkwortnounMWEbog plant of pine barrens of southeastern United States having spikes of irregular yellow-orange flowersverified
Orange Peel FungusnounMWEa discomycete with bright orange cup-shaped or saucer-shaped fruiting bodies and pale orange exteriorsverified
Orange SneezeweednounMWEstout perennial herb of western United States having flower heads with drooping orange-yellow raysverified
Orange ToastnounMWEbuttered toast with sugar and grated orange rind and a little orange juiceverified
Orange-Blossom OrchidnounMWEdiminutive Australian orchid with loose racemes of fragrant white flowers with purple and orange markings on the lipverified
Oratorynounaddressing an audience formally, usually a long and rhetorical address and often pompousverified
Orbital PointnounMWEthe craniometric point at the lowest point on the lower edge of the orbitverified