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Glossary · Nouns · O

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TermTypeDefinitionClassificationsUpdated
Oesophagoscopenounan optical instrument for examining the inside of the esophagusverifiedMay 18, 2026
Oesophagusnounthe passage between the pharynx and the stomachverifiedMay 18, 2026
Oestradiolnounthe most powerful female hormone that occurs naturallyverifiedMay 18, 2026
Oestriolnouna naturally occurring estrogenic hormoneverifiedMay 18, 2026
Oestrogennouna general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristicsverifiedMay 18, 2026
Oestronenouna naturally occurring weak estrogenic hormone secreted by the mammalian ovaryverifiedMay 18, 2026
Oestrusnounapplies to nonhuman mammals: a state or period of heightened sexual arousal and activityverifiedMay 18, 2026
Oeuvrenounthe total or a substantial part of the output of a writer or artistverifiedMay 18, 2026
Off-Axis ReflectornounMWEa reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewedverifiedMay 18, 2026
Off-Broadwaynounlow-budget theaters located outside the Broadway area in ManhattanverifiedMay 18, 2026
Off-CardnounRefers to data that is not stored within the PIV card or computation that is not done by the Integrated Circuit Chip (ICC) of the PIV card.DataRegulatedCUIMay 9, 2026
Off-Daynouna day when things go poorlyverifiedMay 18, 2026
Off-Licencenouna store that sells alcoholic beverages for consumption elsewhereverifiedMay 18, 2026
Off-line AttacknounMWEAn attack where the Attacker obtains some data (typically by eavesdropping on an authentication protocol run, or by penetrating a system and stealing security files) that he/she is able to analyze in a system of his/her own choosing.ThreatMay 9, 2026
Off-line CryptosystemnounMWECryptographic system in which encryption and decryption are performed independently of the transmission and reception functions.CapabilityMay 12, 2026
Off-Line EquipmentnounMWEelectronic equipment not in direct communication (or under the control of) the central processing unitverifiedMay 18, 2026
Off-Line OperationnounMWEa operation performed by off-line equipment not under the control of the central processing unitverifiedMay 18, 2026
Off-Roadernouna bicycle with a sturdy frame and fat tiresverifiedMay 18, 2026
Off-Seasonnounthe season when travel is least active and rates are lowestverifiedMay 18, 2026
Off-Speed PitchnounMWEa baseball thrown with little velocity when the batter is expecting a fastballverifiedMay 18, 2026
Offalnounviscera and trimmings of a butchered animal often considered inedible by humansverifiedMay 18, 2026
Offencenounthe team that has the ball (or puck) and is trying to scoreverifiedMay 18, 2026
Offendernouna person who transgresses moral or civil lawverifiedMay 18, 2026
Offensenounthe team that has the ball (or puck) and is trying to scoreverifiedMay 18, 2026
Offensivenessnounthe quality of being offensiveverifiedMay 18, 2026
Offer PricenounMWE(stock market) the price at which a broker is willing to sell a certain securityverifiedMay 18, 2026
Offerernounsomeone who presents something to another for acceptance or rejectionverifiedMay 18, 2026
Offeringnounthe act of contributing to the funds of a church or charityverifiedMay 18, 2026
Offerornounsomeone who presents something to another for acceptance or rejectionverifiedMay 18, 2026
Offertorynounthe offerings of the congregation at a religious serviceverifiedMay 18, 2026
Officenounthe actions and activities assigned to or required or expected of a person or groupverifiedMay 18, 2026
Office BlocknounMWEa building containing offices where work is doneverifiedMay 18, 2026
Office BoynounMWEa young man who is employed to do odd jobs in a business officeverifiedMay 18, 2026
Office BuildingnounMWEa building containing offices where work is doneverifiedMay 18, 2026
Office FurniturenounMWEfurniture intended for use in an officeverifiedMay 18, 2026
Office of Foreign Asset Control (OFAC)nounMWEThe Office of Foreign Assets Control, United States Department of the Treasury, administers and enforces economic sanctions programs primarily against countries and groups of individuals such as terrorists and narcotics traffickers. The sanctions can be either comprehensive or selective, using the blocking of assets and trade restrictions to accomplish foreign policy and national security goals.OrganizationRegulatedMay 9, 2026
Office of Foreign Assets Control (OFAC)nounMWEThe Office of Foreign Assets Control, Department of the Treasury, administers and enforces economic sanctions programs primarily against countries and groups of individuals such as terrorists and narcotics traffickers. The sanctions can be either comprehensive or selective, using the blocking of assets and trade restrictions to accomplish foreign policy and national security goals.OrganizationRegulatedMay 12, 2026
Office StaffnounMWEprofessional or clerical workers in an officeverifiedMay 18, 2026
Office-Bearernounthe person who holds an officeverifiedMay 18, 2026
Officeholdernounsomeone who is appointed or elected to an office and who holds a position of trustverifiedMay 18, 2026
Officer's MessnounMWEa mess for the exclusive use of officersverifiedMay 18, 2026
Official DocumentnounMWE(law) a document that states some contractual relationship or grants some rightverifiedMay 18, 2026
Official EmissarynounMWEa member of a legationverifiedMay 18, 2026
Official ImmunitynounMWEpersonal immunity accorded to a public official from liability to anyone injured by actions that are the consequence of exerting official authorityverifiedMay 18, 2026
Official InformationnounMWEAll information in the custody and control of a U.S. government department or agency that was acquired by U.S. government employees as a part of their official duties or because of their official status and has not been cleared for public release.DataRegulatedCUIMay 9, 2026
Officialdomnounpeople elected or appointed to administer a governmentverifiedMay 18, 2026
Officialesenounthe style of writing characteristic of some government officials: formal and obscureverifiedMay 18, 2026
Officiantnouna clergyman who officiates at a religious ceremony or serviceverifiedMay 18, 2026
Officiatingnounthe act of umpiringverifiedMay 18, 2026
Officiationnounthe performance of a religious or ceremonial or public dutyverifiedMay 18, 2026
Officiousnessnounaggressiveness as evidenced by intrudingverifiedMay 18, 2026
Offingnounthe part of the sea that can be seen from the shore and is beyond the anchoring areaverifiedMay 18, 2026
Offline LearningnounMWEimplies ... a static dataset that [one] know[s] from the start and the parameters of [one's] machine learning algorithm are adjusted to the whole dataset at once often loading the whole dataset into memory or in batches.ProcessMay 18, 2026
Offprintnouna separately printed article that originally appeared in a larger publicationverifiedMay 18, 2026
Offset LithographynounMWEoffset printing by lithographyverifiedMay 18, 2026
Offset PrintingnounMWEa plate makes an inked impression on a rubber-blanketed cylinder, which in turn transfers it to the paperverifiedMay 18, 2026
Offsetting BalancenounMWEa minimum credit balance that a bank may require a borrower to keep on deposit as a condition for granting a loanverifiedMay 18, 2026
Offshootnouna natural consequence of developmentverifiedMay 18, 2026
Offshore RignounMWEdrilling rig consisting of an offshore platform (floating or fixed to the sea bed) from which many oil wells can be bored radiallyverifiedMay 18, 2026
offsite backupnounMWEA backup process or facility that stores backup data or applications external to the organization or core IT environmentProcessRegulatedMay 12, 2026
Offsite rotationnounMWEUsed for backup and/or disaster recovery; moving a copy of the most current database, information, file, or tape to an offsite storage facility to be used only in an emergency.ProcessRegulatedMay 9, 2026
Offspringnounsomething that comes into existence as a resultverifiedMay 18, 2026
Oftennessnounthe number of occurrences within a given time periodverifiedMay 18, 2026
Ogdoadnounthe cardinal number that is the sum of seven and oneverifiedMay 18, 2026
Ogeenouna molding that (in section) has the shape of an S with the convex part above and the concave part belowverifiedMay 18, 2026
Ogee ArchnounMWEa pointed arch having an S-shape on both sidesverifiedMay 18, 2026
Ogivenounfront consisting of the conical head of a missile or rocket that protects the payload from heat during its passage through the atmosphereverifiedMay 18, 2026
Oglernouna viewer who gives a flirtatious or lewd look at another personverifiedMay 18, 2026
Ogrenoun(folklore) a giant who likes to eat human beingsverifiedMay 18, 2026
Ogressnoun(folklore) a female ogreverifiedMay 18, 2026
Ohmnouna unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampereverifiedMay 18, 2026
Ohmagenounthe ohmic resistance of a conductorverifiedMay 18, 2026
Ohmic ResistancenounMWEa material's opposition to the flow of electric currentverifiedMay 18, 2026
Ohmmeternouna meter for measuring electrical resistance in ohmsverifiedMay 18, 2026
Oil BeetlenounMWEany of various beetles that exude an oily substance from the leg joints that deters enemiesverifiedMay 18, 2026
Oil BurnernounMWEa furnace that burns oilverifiedMay 18, 2026
Oil BusinessnounMWEan industry that produces and delivers oil and oil productsverifiedMay 18, 2026
Oil CakenounMWEmass of e.g. linseed or cottonseed or soybean from which the oil has been pressedverifiedMay 18, 2026
Oil CartelnounMWEa cartel of companies or nations formed to control the production and distribution of oilverifiedMay 18, 2026
Oil ChangenounMWEreplacing dirty oil with cleanverifiedMay 18, 2026
Oil ColornounMWEoil paint containing pigment that is used by an artistverifiedMay 18, 2026
Oil ColournounMWEoil paint containing pigment that is used by an artistverifiedMay 18, 2026
Oil CompanynounMWEa company that sells oilverifiedMay 18, 2026
Oil ConservationnounMWEthe conservation of petroleum resourcesverifiedMay 18, 2026
Oil FilternounMWEa filter that removes impurities from the oil used to lubricate an internal-combustion engineverifiedMay 18, 2026
Oil FurnacenounMWEa furnace that burns oilverifiedMay 18, 2026
Oil FuturenounMWEpetroleum bought or sold at an agreed price for delivery at a specified future dateverifiedMay 18, 2026
Oil GeologistnounMWEa specialist in petroleum geologyverifiedMay 18, 2026
Oil GlandnounMWEa gland that secretes oilverifiedMay 18, 2026
Oil HeaternounMWEheater that burns oil (as kerosine) for heating or cookingverifiedMay 18, 2026
Oil IndustrynounMWEan industry that produces and delivers oil and oil productsverifiedMay 18, 2026
Oil LampnounMWEa lamp that burns oil (as kerosine) for lightverifiedMay 18, 2026
Oil MealnounMWEground oil cakeverifiedMay 18, 2026
Oil NutnounMWEoily drupaceous fruit of rabbitwoodverifiedMay 18, 2026
Oil of ClovesnounMWEessential oil obtained from cloves and used to flavor medicinesverifiedMay 18, 2026
Oil of TurpentinenounMWEvolatile liquid distilled from turpentine oleoresinverifiedMay 18, 2026
Oil of VitriolnounMWE(H2SO4) a highly corrosive acid made from sulfur dioxideverifiedMay 18, 2026
Oil of WintergreennounMWEoil or flavoring obtained from the creeping wintergreen or teaberry plantverifiedMay 18, 2026
Oil PaintnounMWEpaint in which a drying oil is the vehicleverifiedMay 18, 2026
Oil PainternounMWEa painter who uses oil paintsverifiedMay 18, 2026