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Glossary · MWE Terms · O

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TermTypeDefinitionClassificationsUpdated
O RingnounMWEa gasket consisting of a flat ring of rubber or plasticverifiedMay 18, 2026
Oak ApplenounMWEoak gall caused by larvae of a cynipid waspverifiedMay 18, 2026
Oak BlightnounMWEa black plant louse that lives on oaks and dogwoodsverifiedMay 18, 2026
Oak ChestnutnounMWEa tree of the genus CastanopsisverifiedMay 18, 2026
Oak FernnounMWEbright blue-green fern widely distributed especially in damp acid woodlands of temperate northern hemisphereverifiedMay 18, 2026
Oak TreenounMWEa deciduous tree of the genus QuercusverifiedMay 18, 2026
Oak-Leaved GoosefootnounMWEannual European plant with spikes of greenish flowers and leaves that are white and hairy on the undersideverifiedMay 18, 2026
Oakleaf GoosefootnounMWEannual European plant with spikes of greenish flowers and leaves that are white and hairy on the undersideverifiedMay 18, 2026
Oast HousenounMWEa building containing an oast (a kiln for drying hops)verifiedMay 18, 2026
Oat Cell CarcinomanounMWEhighly malignant carcinoma composed of small round or egg-shaped cells with little cytoplasmverifiedMay 18, 2026
Oatmeal CookienounMWEcookies containing rolled oatsverifiedMay 18, 2026
Obedience PlantnounMWEwhite-flowered West Indian plant whose root yields arrowroot starchverifiedMay 18, 2026
Obedient PlantnounMWENorth American plant having a spike of two-lipped pink or white flowersverifiedMay 18, 2026
Obesity DietnounMWEa diet designed to help you lose weight (especially fat)verifiedMay 18, 2026
Obidoxime ChloridenounMWEa chloride used as an antidote for nerve gases such as sarin or VXverifiedMay 18, 2026
Obiter DictumnounMWEan opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not bindingverifiedMay 18, 2026
Object BallnounMWEthe billiard ball that is intended to be the first ball struck by the cue ballverifiedMay 18, 2026
Object codenounMWEThe machine code generated by a source code language processor such as an assembler or compiler. A file of object code may be executable immediately or it may require linking with other object code files (e.g., libraries, to produce a complete executable program).candidateMay 12, 2026
Object GlassnounMWEthe lens or system of lenses in a telescope or microscope that is nearest the object being viewedverifiedMay 18, 2026
Object IdentifiernounMWEA specialized formatted number that is registered with an internationally recognized standards organization. The unique alphanumeric/numeric identifier registered under the ISO registration standard to reference a specific object or object class. In the federal government PKI, they are used to uniquely identify each of the four policies and cryptographic algorithms supported.verifiedAug 30, 2026
Object LanguagenounMWEa computer language into which something written in another computer language is to be translatedverifiedMay 18, 2026
Object LensnounMWEthe lens or system of lenses in a telescope or microscope that is nearest the object being viewedverifiedMay 18, 2026
Object LessonnounMWEpunishment intended as a warning to othersverifiedMay 18, 2026
Object of a PrepositionnounMWEthe object governed by a prepositionverifiedMay 18, 2026
Object of the VerbnounMWEthe object that receives the direct action of the verbverifiedMay 18, 2026
Object ProgramnounMWEA program that has been translated into machine language and is ready to be run (i.e., executed) by the computer.candidateMay 12, 2026
Object RecognitionnounMWEthe visual perception of familiar objectsverifiedMay 18, 2026
Object ReusenounMWEReassignment and reuse of a storage medium containing one or more objects after ensuring no residual data remains on the storage medium.verifiedAug 30, 2026
Object-Oriented DatabasenounMWEa database in which the operations carried out on information items (data objects) are considered part of their definitionverifiedMay 18, 2026
Object-Oriented Database Management SystemnounMWEa database management system designed to manage an object-oriented databaseverifiedMay 18, 2026
Object-Oriented ProgramingnounMWEcreating a program that can use and support objectsverifiedMay 18, 2026
Object-Oriented Programing LanguagenounMWE(computer science) a programming language that enables the programmer to associate a set of procedures with each type of data structureverifiedMay 18, 2026
Object-Oriented ProgrammingnounMWEcreating a program that can use and support objectsverifiedMay 18, 2026
Object-Oriented Programming LanguagenounMWE(computer science) a programming language that enables the programmer to associate a set of procedures with each type of data structureverifiedMay 18, 2026
Objective CasenounMWEthe case of nouns serving as the direct object of a verbverifiedMay 18, 2026
Objective EvidencenounMWEdata supporting the existence or verity of something (note: can be obtained through observation, measurement, test, or other means).verifiedAug 28, 2026
Objective LensnounMWEthe lens or system of lenses in a telescope or microscope that is nearest the object being viewedverifiedMay 18, 2026
Objet D'artnounMWEa work of art of some artistic valueverifiedMay 18, 2026
Oblanceolate LeafnounMWEa leaf having a rounded apex and tapering baseverifiedMay 18, 2026
Obligate AnaerobenounMWEan organism that cannot grow in the presence of oxygenverifiedMay 18, 2026
Oblique AnglenounMWEan angle that is not a right angle or a multiple of a right angleverifiedMay 18, 2026
Oblique BandagenounMWEa bandage in which successive turns proceed obliquely up or down a limbverifiedMay 18, 2026
Oblique CasenounMWEany grammatical case other than the nominativeverifiedMay 18, 2026
Oblique TrianglenounMWEa triangle that contains no right angleverifiedMay 18, 2026
Oblique Vein of the Left AtriumnounMWEa tributary of the coronary sinusverifiedMay 18, 2026
Oblong LeafnounMWEa simple leaf that is rounded at each end with parallel sidesverifiedMay 18, 2026
Oblong WoodsianounMWEa common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate frondsverifiedMay 18, 2026
Oboe D'amorenounMWEan oboe pitched a minor third lower than the ordinary oboeverifiedMay 18, 2026
Oboe Da CaccianounMWEan alto oboeverifiedMay 18, 2026
Obovate LeafnounMWEan egg-shaped leaf with the narrower end at the baseverifiedMay 18, 2026
Observation DomenounMWElookout consisting of a dome-shaped observatoryverifiedMay 18, 2026
Observation PostnounMWEan elevated post affording a wide viewverifiedMay 18, 2026
Observation TowernounMWEa structure commanding a wide view of its surroundingsverifiedMay 18, 2026
Observed FirenounMWEfire for which the point of impact (the burst) can be seen by an obserververifiedMay 18, 2026
Observer's MeridiannounMWEa meridian that passes through the observer's zenithverifiedMay 18, 2026
Obsessive-Compulsive DisordernounMWEan anxiety disorder characterized by recurrent and persistent thoughts and feelings and repetitive, ritualized behaviorsverifiedMay 18, 2026
Obsessive-Compulsive PersonalitynounMWEpersonality characterized by a strong need to repeat certain acts or ritualsverifiedMay 18, 2026
Obstacle RacenounMWEa race in which competitors must negotiate obstaclesverifiedMay 18, 2026
Obstetrical DeliverynounMWEthe act of delivering a childverifiedMay 18, 2026
Obstetrical ToadnounMWEEuropean toad whose male carries the fertilized eggs wrapped around its hind legs until they hatchverifiedMay 18, 2026
Obstruction of JusticenounMWEimpeding those who seek justice in a court (as by trying to influence or intimidate any juror or witness or officer of the court)verifiedMay 18, 2026
Obstructive ShocknounMWEshock caused by obstruction of blood flowverifiedMay 18, 2026
obtrude uponverbMWEto intrude upon, infringe, encroach on, violateverifiedJun 3, 2026
Obturator VeinnounMWEa vein formed by the union of tributaries that drain the hip joints and thigh musclesverifiedMay 18, 2026
Obtuse AnglenounMWEan angle between 90 and 180 degreesverifiedMay 18, 2026
Obtuse LeafnounMWEa simple leaf having a rounded or blunt tipverifiedMay 18, 2026
Obtuse TrianglenounMWEa triangle that contains an obtuse interior angleverifiedMay 18, 2026
Obtuse-Angled TrianglenounMWEa triangle that contains an obtuse interior angleverifiedMay 18, 2026
Occam's RazornounMWEthe problem solving principle which states that among competing theories, one ought to choose the theory that relies on the fewest assumptions. verifiedMay 18, 2026
Occipital BonenounMWEa saucer-shaped membrane bone that forms the back of the skullverifiedMay 18, 2026
Occipital CortexnounMWEthat part of the cerebral cortex in either hemisphere of the brain lying in the back of the headverifiedMay 18, 2026
Occipital GyrusnounMWEany of the convolutions of the outer surface of the occipital lobe of the cerebrumverifiedMay 18, 2026
Occipital LobenounMWEthat part of the cerebral cortex in either hemisphere of the brain lying in the back of the headverifiedMay 18, 2026
Occipital ProtuberancenounMWEprominence on the outer surface of the occipital boneverifiedMay 18, 2026
Occipital VeinnounMWEa vein that drains the occipital regionverifiedMay 18, 2026
Occipitomastoid SuturenounMWEthe suture between the occipital and the temporal bonesverifiedMay 18, 2026
Occluded FrontnounMWE(meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloftverifiedMay 18, 2026
Occult ArtsnounMWEsupernatural practices and techniquesverifiedMay 18, 2026
Occupancy RatenounMWEthe percentage of all rental units (as in hotels) are occupied or rented at a given timeverifiedMay 18, 2026
Occupation LicencenounMWEa license to pursue a particular occupationverifiedMay 18, 2026
Occupation LicensenounMWEa license to pursue a particular occupationverifiedMay 18, 2026
Occupational DiseasenounMWEdisease or disability resulting from conditions of employment (usually from long exposure to a noxious substance or from continuous repetition of certain acts)verifiedMay 18, 2026
Occupational GroupnounMWEa body of people doing the same kind of workverifiedMay 18, 2026
Occupational HazardnounMWEany condition of a job that can result in illness or injuryverifiedMay 18, 2026
Occupational Safety and Health ActnounMWEa law passed by the United States Congress that created the Occupational Safety and Health Administration to prevent employees from being injured or contracting diseases in the course of their employmentverifiedMay 18, 2026
Occupational TherapynounMWEtherapy based on engagement in meaningful activities of daily life, especially to enable or encourage participation in such activities in spite of impairments or limitations in physical or mental functionsverifiedMay 18, 2026
Ocean BottomnounMWEthe bottom of a sea or oceanverifiedMay 18, 2026
Ocean CurrentnounMWEthe steady flow of surface ocean water in a prevailing directionverifiedMay 18, 2026
Ocean FloornounMWEthe bottom of a sea or oceanverifiedMay 18, 2026
Ocean LinernounMWEa large commercial ship (especially one that carries passengers on a regular schedule)verifiedMay 18, 2026
Ocean PerchnounMWElarge fish of northern Atlantic coasts of America and EuropeverifiedMay 18, 2026
Ocean PoutnounMWEcommon along northeastern coast of North AmericaverifiedMay 18, 2026
Ocean SunfishnounMWEamong the largest bony fishverifiedMay 18, 2026
Ocean TripnounMWEan act of traveling by waterverifiedMay 18, 2026
Oceanic AbyssnounMWEa long steep-sided depression in the ocean floorverifiedMay 18, 2026
Oceanic BirdnounMWEbird of the open seasverifiedMay 18, 2026
Oceanic Whitetip SharknounMWElarge deep-water shark with white-tipped dorsal finverifiedMay 18, 2026
Ocellated TurkeynounMWEwild turkey of Central America and northern South AmericaverifiedMay 18, 2026
Ochna FamilynounMWEfamily of tropical evergreen trees and shrubs with thick shining parallel-veined leavesverifiedMay 18, 2026
Ockham's RazornounMWEthe principle that entities should not be multiplied needlesslyverifiedMay 18, 2026