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Glossary · Nouns · O

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TermTypeDefinitionClassificationsUpdated
Osteolysisnounlysis of bone caused by disease or infection or inadequate blood supplyverifiedMay 18, 2026
Osteomanouna slow growing benign tumor of consisting of bone tissueverifiedMay 18, 2026
Osteomalacianounabnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin DverifiedMay 18, 2026
Osteomyelitisnounan inflammation of bone and bone marrow (usually caused by bacterial infection)verifiedMay 18, 2026
Osteopathnouna therapist who manipulates the skeleton and musclesverifiedMay 18, 2026
Osteopathistnouna therapist who manipulates the skeleton and musclesverifiedMay 18, 2026
Osteopathynountherapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and musclesverifiedMay 18, 2026
Osteopetrosisnounan inherited disorder characterized by an increase in bone densityverifiedMay 18, 2026
Osteophytenounsmall abnormal bony outgrowthverifiedMay 18, 2026
Osteoporosisnounabnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calciumverifiedMay 18, 2026
Osteosarcomanounmalignant bone tumorverifiedMay 18, 2026
Osteosclerosisnounabnormal hardening or eburnation of boneverifiedMay 18, 2026
Osteosclerosis CongenitanounMWEan inherited skeletal disorder beginning before birthverifiedMay 18, 2026
Osteostracannounextinct jawless fish of the Devonian with armored headverifiedMay 18, 2026
Osteotomynounsurgical sectioning of boneverifiedMay 18, 2026
Ostiariusnounthe lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic ChurchverifiedMay 18, 2026
Ostiarynounthe lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic ChurchverifiedMay 18, 2026
Ostinatonouna musical phrase repeated over and over during a compositionverifiedMay 18, 2026
Ostiolenouna small pore especially one in the reproductive bodies of certain algae and fungi through which spores passverifiedMay 18, 2026
Ostlernounsomeone employed in a stable to take care of the horsesverifiedMay 18, 2026
Ostomynounsurgical procedure that creates an artificial opening for the elimination of bodily wastesverifiedMay 18, 2026
Ostracismnounthe state of being banished or ostracized (excluded from society by general consent)verifiedMay 18, 2026
Ostracodnountiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shellverifiedMay 18, 2026
Ostracodermnounextinct fish-like jawless vertebrate having a heavily armored bodyverifiedMay 18, 2026
Ostrichnouna person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)verifiedMay 18, 2026
Ostrich FernnounMWEtall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumesverifiedMay 18, 2026
Oswego TeanounMWEperennial aromatic herb of eastern North America having variously colored tubular flowers in dense showy headsverifiedMay 18, 2026
Otalgianounan ache localized in the middle or inner earverifiedMay 18, 2026
Othernessnounthe quality of being not alikeverifiedMay 18, 2026
Otherworldnounan abstract spiritual world beyond earthly realityverifiedMay 18, 2026
Otherworldlinessnounconcern with things of the spiritverifiedMay 18, 2026
Othonnanouna South African plant of the genus Othonna having smooth often fleshy leaves and heads of yellow flowersverifiedMay 18, 2026
Otic GanglionnounMWEan autonomic ganglion whose postganglionic fibers are distributed to the parotid glandverifiedMay 18, 2026
Otitisnouninflammation of the earverifiedMay 18, 2026
Otitis ExternanounMWEinflammation of the external ear (including auricle and ear canal)verifiedMay 18, 2026
Otitis InternanounMWEinflammation of the inner earverifiedMay 18, 2026
Otitis MedianounMWEinflammation of the middle earverifiedMay 18, 2026
Otoganglionnounan autonomic ganglion whose postganglionic fibers are distributed to the parotid glandverifiedMay 18, 2026
Otolaryngologistnouna specialist in the disorders of the ear or nose or throatverifiedMay 18, 2026
Otolaryngologynounthe medical specialty that deals with diseases of the ear, nose and throatverifiedMay 18, 2026
Otologistnouna physician who specializes in the ear and its diseasesverifiedMay 18, 2026
Otologynounthe branch of medicine concerned with the earverifiedMay 18, 2026
Otoplastynounreconstructive surgery of the auricle of the external earverifiedMay 18, 2026
Otorhinolaryngologistnouna specialist in the disorders of the ear or nose or throatverifiedMay 18, 2026
Otorhinolaryngologynounthe medical specialty that deals with diseases of the ear, nose and throatverifiedMay 18, 2026
Otorrheanoundischarge from the external earverifiedMay 18, 2026
Otosclerosisnounhereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafnessverifiedMay 18, 2026
Otoscopenounmedical instrument consisting of a magnifying lens and lightverifiedMay 18, 2026
Ottarnounessential oil or perfume obtained from flowersverifiedMay 18, 2026
Ottava RimanounMWEa stanza of eight lines of heroic verse with the rhyme scheme abababccverifiedMay 18, 2026
Otternounfreshwater carnivorous mammal having webbed and clawed feet and dark brown furverifiedMay 18, 2026
Otter ShrewnounMWEamphibious African insectivorous mammal that resembles an otterverifiedMay 18, 2026
Otterhoundnounhardy British hound having long pendulous ears and a thick coarse shaggy coat with an oily undercoatverifiedMay 18, 2026
Oubliettenouna dungeon with the only entrance or exit being a trap door in the ceilingverifiedMay 18, 2026
Ouguiyanounthe basic unit of money in MauritaniaverifiedMay 18, 2026
Ouijanouna board containing the letters of the alphabet, used to communicate with spiritsverifiedMay 18, 2026
Ouija BoardnounMWEa board with the alphabet on itverifiedMay 18, 2026
Ouncenouna unit of weight equal to one sixteenth of a pound or 16 drams or 28.349 gramsverifiedMay 18, 2026
Ouselnouncommon black European thrushverifiedMay 18, 2026
Ousternounthe act of ejecting someone or forcing them outverifiedMay 18, 2026
Oustingnounthe act of ejecting someone or forcing them outverifiedMay 18, 2026
Out of BoundsnounMWEa line that marks the side boundary of a playing fieldverifiedMay 18, 2026
Out-And-Outernounsomeone who is excellent at somethingverifiedMay 18, 2026
Out-Basketnouna wood or metal receptacle placed on your desk to hold your outgoing materialverifiedMay 18, 2026
Out-Migrationnounmigration from a place (especially migration from your native country in order to settle in another)verifiedMay 18, 2026
Out-of-bandnounActivity outside of the primary means of interfacing with the customer. For example, if a user is performing activity online, he or she may be authenticated through a one-time password sent via text message.ControlRegulatedMay 12, 2026
Out-Of-Body ExperiencenounMWEthe dissociative experience of observing yourself from an external perspective as though your mind or soul had left and was observing your bodyverifiedMay 18, 2026
Out-Of-Court SettlementnounMWEresolution of a dispute prior to the rendering of a final decision by the trial courtverifiedMay 18, 2026
Out-Of-Doorsnounwhere the air is unconfinedverifiedMay 18, 2026
Out-Of-The-Box ThinkingnounMWEthinking that moves away in diverging directions so as to involve a variety of aspects and which sometimes lead to novel ideas and solutionsverifiedMay 18, 2026
Out-Traynouna wood or metal receptacle placed on your desk to hold your outgoing materialverifiedMay 18, 2026
Outagenounthe amount of something (as whiskey or oil) lost in storage or transportationverifiedMay 18, 2026
Outboard MotornounMWEinternal-combustion engine that mounts at stern of small boatverifiedMay 18, 2026
Outboard MotorboatnounMWEa motorboat with an outboard motorverifiedMay 18, 2026
Outbreaknouna sudden violent spontaneous occurrence (usually of some undesirable condition)verifiedMay 18, 2026
Outbuildingnouna building that is subordinate to and separate from a main buildingverifiedMay 18, 2026
Outburstnounan unrestrained expression of emotionverifiedMay 18, 2026
Outcomenouna phenomenon that follows and is caused by some previous phenomenonArtifactMay 18, 2026
Outcome measurenounMWERepresents the consequences of actions previously taken; often referred to as a lag indicator Scope Note: Outcome measure frequently focuses on results at the end of a time period and characterize historic performance. They are also referred to as a key goal indicator (KGI) and used to indicate whether goals have been met. These can be measured only after the fact and, therefore, are called lag indicators.MetricMay 9, 2026
Outcroppingnounthe part of a rock formation that appears above the surface of the surrounding landverifiedMay 18, 2026
Outdoor GamenounMWEan athletic game that is played outdoorsverifiedMay 18, 2026
Outdoor MannounMWEsomeone who enjoys outdoor activitiesverifiedMay 18, 2026
Outdoor SportnounMWEa sport that is played outdoorsverifiedMay 18, 2026
Outdoor StagenounMWEa platform where a (brass) band can play in the open airverifiedMay 18, 2026
Outdoorsnounwhere the air is unconfinedverifiedMay 18, 2026
Outdoorsmannouna person who spends time outdoors (e.g., hunting or fishing)verifiedMay 18, 2026
Outdoorswomannouna woman who spends time outdoors (e.g., hunting and fishing)verifiedMay 18, 2026
Outer BoundarynounMWEthe outside boundary or surface of somethingverifiedMay 18, 2026
Outer EarnounMWEthe part of the ear visible externallyverifiedMay 18, 2026
Outer GarmentnounMWEa garment worn over other garmentsverifiedMay 18, 2026
Outer PlanetnounMWE(astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)verifiedMay 18, 2026
Outer SpacenounMWEany location outside the Earth's atmosphereverifiedMay 18, 2026
Outercoursenounsexual stimulation without vaginal penetrationverifiedMay 18, 2026
Outerwearnounclothing for use outdoorsverifiedMay 18, 2026
Outfallnounthe outlet of a river or drain or other source of waterverifiedMay 18, 2026
Outfieldnounthe area of a baseball playing field beyond the lines connecting the basesverifiedMay 18, 2026
Outfieldernouna fielder in cricket who is stationed in the outfieldverifiedMay 18, 2026
Outfitternouna shop that provides equipment for some specific purposeverifiedMay 18, 2026
Outfittingnounthe act of renovating and fitting out a shipverifiedMay 18, 2026
Outflownounthe discharge of a fluid from some containerverifiedMay 18, 2026