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Glossary · Nouns · U

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TermTypeDefinitionClassificationsUpdated
Untyingnounloosening the ties that fasten somethingverifiedMay 18, 2026
Untypicalitynounany state that is not typicalverifiedMay 18, 2026
Ununbiumnouna radioactive transuranic elementverifiedMay 18, 2026
Ununhexiumnouna radioactive transuranic elementverifiedMay 18, 2026
Ununpentiumnouna radioactive transuranic elementverifiedMay 18, 2026
Ununquadiumnouna radioactive transuranic elementverifiedMay 18, 2026
Ununtriumnouna radioactive transuranic elementverifiedMay 18, 2026
Unusefulnessnounthe quality of having no practical useverifiedMay 18, 2026
unusual activitynounMWEUnexpected or extraordinary behavior.EventMay 9, 2026
Unusual PersonnounMWEa person who is unusualverifiedMay 18, 2026
Unusualnessnoununcommonness by virtue of being unusualverifiedMay 18, 2026
Unvariednessnouncharacterized by an absence of variationverifiedMay 18, 2026
Unveilingnounputting on display for the first timeverifiedMay 18, 2026
Unwarinessnounthe trait of not being cautious and watchfulverifiedMay 18, 2026
Unwelcome GuestnounMWEsomeone who gets into a party without an invitation or without payingverifiedMay 18, 2026
Unwelcome PersonnounMWEa person who for some reason is not wanted or welcomeverifiedMay 18, 2026
Unwellnessnounimpairment of normal physiological function affecting part or all of an organismverifiedMay 18, 2026
Unwholesomenessnounthe quality of being unhealthful and generally bad for youverifiedMay 18, 2026
Unwieldinessnounthe quality of being difficult to direct or control by reason of complexityverifiedMay 18, 2026
Unwillingnessnounthe trait of being unwillingverifiedMay 18, 2026
Unwisenessnounthe trait of acting stupidly or rashlyverifiedMay 18, 2026
Unworthinessnounthe quality of being not particularly suitable or befittingverifiedMay 18, 2026
Unwritten LawnounMWElaw based on customary behaviorverifiedMay 18, 2026
Unyieldingnessnounresoluteness by virtue of being unyielding and inflexibleverifiedMay 18, 2026
Up QuarknounMWEa stable quark with an electric charge of +2/3 and a mass 607 times that of an electronverifiedMay 18, 2026
Up-Bownounan upward stroke from the tip to the heel of the bowverifiedMay 18, 2026
Up-To-Datenessnounthe property of belonging to the present timeverifiedMay 18, 2026
Upbraidernounsomeone who finds fault or imputes blameverifiedMay 18, 2026
Upbraidingnouna severe scoldingverifiedMay 18, 2026
Upbringingnounhelping someone grow up to be an accepted member of the communityverifiedMay 18, 2026
Upcastnounair passage consisting of a ventilation shaft through which air leaves a mineverifiedMay 18, 2026
Update a CertificatenounMWEThe act or process by which data items bound in an existing public key certificate, especially authorizations granted to the subject, are changed by issuing a new certificate.CredentialMay 9, 2026
updatingnounThe act of changing something to bring it up to date (usually by adding something).ProcessMay 9, 2026
Updraftnouna strong upward air currentverifiedMay 18, 2026
Upendingnounturning upside downverifiedMay 18, 2026
UpheavalnounA state of violent disturbance and disorder, generally in politics or social conditions.verifiedMay 18, 2026
Upholdernounsomeone who upholds or maintainsverifiedMay 18, 2026
Upholsterernouna craftsman who upholsters furnitureverifiedMay 18, 2026
Upholsterynouncovering on a piece of furniture, including padding, springs, webbing and fabricverifiedMay 18, 2026
Upholstery MaterialnounMWEthe fabric used in upholsteringverifiedMay 18, 2026
Upholstery NeedlenounMWEany of several very heavy and sometimes curved sewing needles used by upholsterersverifiedMay 18, 2026
Upkeepnounthe act of sustaining life by food or providing a means of subsistenceverifiedMay 18, 2026
Upland CottonnounMWEnative tropical American plant now cultivated in the United States yielding short-staple cottonverifiedMay 18, 2026
Upland PlovernounMWElarge plover-like sandpiper of North American fields and uplandsverifiedMay 18, 2026
Upland SandpipernounMWElarge plover-like sandpiper of North American fields and uplandsverifiedMay 18, 2026
Upland White AsternounMWEtufted rigid North American perennial with loose clusters of white flowersverifiedMay 18, 2026
Upliftingnounthe rise of somethingverifiedMay 18, 2026
Uplinknouna transmission from Earth to a spacecraft or the path of such a transmissionverifiedMay 18, 2026
Upper BalconynounMWErearmost or uppermost area in the balcony containing the least expensive seatsverifiedMay 18, 2026
Upper BerthnounMWEthe higher of two berthsverifiedMay 18, 2026
Upper BoundnounMWE(mathematics) a number equal to or greater than any other number in a given setverifiedMay 18, 2026
Upper CannonnounMWEcannon that provides plate armor for the upper armverifiedMay 18, 2026
Upper ClassnounMWEthe class occupying the highest position in the social hierarchyverifiedMay 18, 2026
Upper CrustnounMWEthe class occupying the highest position in the social hierarchyverifiedMay 18, 2026
Upper DecknounMWEa higher deckverifiedMay 18, 2026
Upper HandnounMWEposition of advantage and controlverifiedMay 18, 2026
Upper JawnounMWEthe jaw in vertebrates that is fused to the craniumverifiedMay 18, 2026
Upper JawbonenounMWEthe jaw in vertebrates that is fused to the craniumverifiedMay 18, 2026
Upper LimitnounMWEthe limit on the upper (or northernmost) side of somethingverifiedMay 18, 2026
Upper MantlenounMWEthe upper part of the mantleverifiedMay 18, 2026
Upper Respiratory InfectionnounMWEinfection of the upper respiratory tractverifiedMay 18, 2026
Upper Respiratory TractnounMWEthe nose and throat and tracheaverifiedMay 18, 2026
Upper SidenounMWEthe highest or uppermost side of anythingverifiedMay 18, 2026
Upper SurfacenounMWEthe side that is uppermostverifiedMay 18, 2026
Upper-Case LetternounMWEone of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasisverifiedMay 18, 2026
Uppercutnouna swinging blow directed upward (especially at an opponent's chin)verifiedMay 18, 2026
Uppishnessnounassumption of airs beyond one's stationverifiedMay 18, 2026
Uppitynessnounassumption of airs beyond one's stationverifiedMay 18, 2026
Upright PianonounMWEa piano with a vertical sounding boardverifiedMay 18, 2026
Uprightnessnounrighteousness as a consequence of being honorable and honestverifiedMay 18, 2026
Uprisingnounorganized opposition to authorityverifiedMay 18, 2026
Uproarnouna state of commotion and noise and confusionverifiedMay 18, 2026
Uprooternouna person who destroys or ruins or lays waste toverifiedMay 18, 2026
Upset PricenounMWE(auction) the minimum price at which a seller of property will entertain bidsverifiedMay 18, 2026
Upset StomachnounMWEa disorder of digestive function characterized by discomfort or heartburn or nauseaverifiedMay 18, 2026
Upsetternounan unexpected winnerverifiedMay 18, 2026
Upshotnouna phenomenon that follows and is caused by some previous phenomenonverifiedMay 18, 2026
Upsidenounthe highest or uppermost side of anythingverifiedMay 18, 2026
Upside-Down CakenounMWEbatter baked atop a layer of sweetened fruit then turned upside down so fruit is on topverifiedMay 18, 2026
Upsilonnounthe 20th letter of the Greek alphabetverifiedMay 18, 2026
Upstagernouna selfish actor who upstages the other actorsverifiedMay 18, 2026
Upstrokenouna stroke normally made in an upward directionverifiedMay 18, 2026
Upsurgenouna sudden or abrupt strong increaseverifiedMay 18, 2026
Uptakenounthe process of taking food into the body through the mouth (as by eating)verifiedMay 18, 2026
Upthrownoun(geology) a rise of land to a higher elevation (as in the process of mountain building)verifiedMay 18, 2026
Upthrustnoun(geology) a rise of land to a higher elevation (as in the process of mountain building)verifiedMay 18, 2026
Upticknouna transaction in the stock market at a price above the price of the preceding transactionverifiedMay 18, 2026
Uptimenouna period of time when something (as a machine or factory) is functioning and available for useverifiedMay 18, 2026
Upturnnounan upward movement or trend as in business activityverifiedMay 18, 2026
Uracilnouna base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidineverifiedMay 18, 2026
Uraemianounaccumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urineverifiedMay 18, 2026
Uranalysisnoun(medicine) the chemical analysis of urine (for medical diagnosis)verifiedMay 18, 2026
Uraninitenouna mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and heliumverifiedMay 18, 2026
Uraniumnouna heavy toxic silvery-white radioactive metallic elementverifiedMay 18, 2026
Uranium 235nounMWEa uranium isotope with mass number 235verifiedMay 18, 2026
Uranium 238nounMWEthe commonest isotope of uraniumverifiedMay 18, 2026
Uranium OrenounMWEany ore from which uranium can be extractedverifiedMay 18, 2026
Uranologistnouna physicist who studies astronomyverifiedMay 18, 2026
Uranologynounthe branch of physics that studies celestial bodies and the universe as a wholeverifiedMay 18, 2026
Uranoplastynounsurgical correction of a defect of the palateverifiedMay 18, 2026