| update | (noun) the act of bringing someone or something up to date | - |
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| (noun) information or data that updates | - |
| updating | (noun) the act of changing something to bring it up to date (usually by adding something) | - |
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| updraft | (noun) a strong upward air current | - |
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| upending | (noun) turning upside down; setting on end | Synonyms: inversion |
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| upgrade | (noun) the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components) | - |
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| (noun) hardware that provides better performance than an earlier version did | - |
| (noun) the property possessed by a slope or surface that rises | Synonyms: rise, rising slope |
| (noun) a reservation that is improved | - |
| (noun) software that provides better performance than an earlier version did | - |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, raise, rise |
| upheaval | (noun) disturbance usually in protest | Synonyms: agitation, excitement, hullabaloo, turmoil |
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| (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: uplift, upthrow, upthrust |
| (noun) a state of violent disturbance and disorder (as in politics or social conditions generally) | Synonyms: Sturm und Drang, turbulence |
| (noun) a violent disturbance | Synonyms: convulsion, turmoil |
| uphill | (noun) the upward slope of a hill | - |
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| upholder | (noun) someone who upholds or maintains | Synonyms: maintainer, sustainer |
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| upholsterer | (noun) a craftsman who upholsters furniture | - |
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| upholstery | (noun) the craft of upholstering | - |
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| (noun) covering (padding and springs and webbing and fabric) on a piece of furniture | - |
| upkeep | (noun) activity involved in maintaining something in good working order | Synonyms: care, maintenance |
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| (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: maintenance, sustainment, sustenance, sustentation |
| upland | (noun) elevated (e.g., mountainous) land | Synonyms: highland |
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| uplift | (noun) a brassiere that lifts and supports the breasts | - |
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| (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: upheaval, upthrow, upthrust |
| uplifting | (noun) the rise of something | - |
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| uplink | (noun) a transmission from Earth to a spacecraft or the path of such a transmission | - |
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| upper | (noun) piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot | - |
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| (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: amphetamine, pep pill, speed |
| (noun) the higher of two berths | Synonyms: upper berth |
| uppercase | (noun) one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis | Synonyms: capital, capital letter, majuscule, upper-case letter |
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| uppercut | (noun) a swinging blow directed upward (especially at an opponent's chin) | - |
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| uppishness | (noun) assumption of airs beyond one's station | Synonyms: uppityness |
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| uppityness | (noun) assumption of airs beyond one's station | Synonyms: uppishness |
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| upright | (noun) a piano with a vertical sounding board | Synonyms: upright piano |
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| (noun) a vertical structural member as a post or stake | Synonyms: vertical |
| uprightness | (noun) righteousness as a consequence of being honorable and honest | Synonyms: rectitude |
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| (noun) position at right angles to the horizon | Synonyms: erectness, verticality, verticalness |
| (noun) the property of being upright in posture | Synonyms: erectness |
| uprising | (noun) organized opposition to authority; a conflict in which one faction tries to wrest control from another | Synonyms: insurrection, rebellion, revolt, rising |
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| uproar | (noun) loud confused noise from many sources | Synonyms: brouhaha, hubbub, katzenjammer |
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| (noun) a state of commotion and noise and confusion | Synonyms: garboil, tumult, tumultuousness |
| uprooter | (noun) a person who destroys or ruins or lays waste to | Synonyms: destroyer, ruiner, undoer, waster |
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| upset | (noun) an improbable and unexpected victory | Synonyms: overturn |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, overthrow |
| (noun) the act of upsetting something | Synonyms: overturn, turnover |
| (noun) a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging | Synonyms: swage |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, perturbation |
| (noun) a physical condition in which there is a disturbance of normal functioning | Synonyms: disorder |
| upsetter | (noun) an unexpected winner; someone who defeats the favorite competitor | - |
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| upshot | (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, effect, event, issue, outcome, result |
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| upside | (noun) the highest or uppermost side of anything | Synonyms: top, top side, upper side |
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| upsilon | (noun) the 20th letter of the Greek alphabet | - |
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| upstage | (noun) the rear part of the stage | - |
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| upstager | (noun) a selfish actor who upstages the other actors | - |
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| upstairs | (noun) the part of a building above the ground floor | - |
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| upstart | (noun) a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright | Synonyms: kip |
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| (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: arriviste, nouveau-riche, parvenu |
| (noun) an arrogant or presumptuous person | - |
| upstroke | (noun) a stroke normally made in an upward direction | - |
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| upsurge | (noun) a sudden or abrupt strong increase | Synonyms: surge |
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| (noun) a sudden forceful flow | Synonyms: rush, spate, surge |
| uptake | (noun) the process of taking food into the body through the mouth (as by eating) | Synonyms: consumption, ingestion, intake |
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| (noun) a process of taking up or using up or consuming | - |
| upthrow | (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: upheaval, uplift, upthrust |
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| upthrust | (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: upheaval, uplift, upthrow |
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| uptick | (noun) a transaction in the stock market at a price above the price of the preceding transaction | - |
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| uptime | (noun) a period of time when something (as a machine or factory) is functioning and available for use | - |
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| uptown | (noun) a residential part of town away from the central commercial district | - |
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| upturn | (noun) an upward movement or trend as in business activity | - |
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| upvote | (noun) A positive vote on a social media website | - |
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| uracil | (noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine | Synonyms: U |
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| uraemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, azotemia, uremia |
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| uranalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: urinalysis |
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| uraninite | (noun) a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore | Synonyms: pitchblende |
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| uranium | (noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons | Synonyms: atomic number 92, U |
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| uranologist | (noun) a physicist who studies astronomy | Synonyms: astronomer, stargazer |
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| uranology | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: astronomy |
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| uranoplasty | (noun) surgical correction of a defect of the palate | - |
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| uranyl | (noun) the bivalent radical UO2 which forms salts with acids | Synonyms: uranyl group, uranyl radical |
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| urarthritis | (noun) a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in deposits of the acid and its salts in the blood and joints | Synonyms: gout, gouty arthritis |
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| urate | (noun) a salt of uric acid | - |
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| uratemia | (noun) presence of abnormal amounts of uric acid salts in the blood; symptom of gout | - |
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| uraturia | (noun) presence of abnormally large amounts of uric acid in the urine; symptom of gout | - |
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| urbanisation | (noun) the social process whereby cities grow and societies become more urban | Synonyms: urbanization |
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| (noun) the condition of being urbanized | Synonyms: urbanization |
| urbanity | (noun) polished courtesy; elegance of manner | - |
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| (noun) the quality or character of life in a city or town | - |
| urbanization | (noun) the social process whereby cities grow and societies become more urban | Synonyms: urbanisation |
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| (noun) the condition of being urbanized | Synonyms: urbanisation |
| urceole | (noun) a vessel that holds water for washing the hands | - |
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| urchin | (noun) poor and often mischievous city child | - |
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| urea | (noun) the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics | Synonyms: carbamide |
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| urease | (noun) an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia; is present in intestinal bacteria | - |
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| ureide | (noun) any compound, of general formula R-CO-NH-CO-NH2 or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of urea. | - |
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| uremia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, azotemia, uraemia |
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| ureter | (noun) either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder | - |
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| ureteritis | (noun) inflammation of the ureter | - |
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| ureterocele | (noun) prolapse of the end of the ureter into the bladder; may obstruct urine flow | - |
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| ureterostenosis | (noun) stenosis of the ureter | - |
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| urethane | (noun) an ester of carbamic acid | - |
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| urethra | (noun) duct through which urine is discharged in most mammals and which serves as the male genital duct | - |
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| urethritis | (noun) inflammation of the urethra; results in painful urination | - |
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| urethrocele | (noun) prolapse of the urethra into the vagina | - |
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| urge | (noun) a strong restless desire | Synonyms: itch |
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| (noun) an instinctive motive | Synonyms: impulse |
| urgency | (noun) pressing importance requiring speedy action | - |
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| (noun) insistent solicitation and entreaty | Synonyms: importunity, urging |
| (noun) the state of being urgent; an earnest and insistent necessity | - |
| (noun) an urgent situation calling for prompt action | - |
| urging | (noun) the act of earnestly supporting or encouraging | - |
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| (noun) a verbalization that encourages you to attempt something | Synonyms: goad, goading, prod, prodding, spur, spurring |
| (noun) insistent solicitation and entreaty | Synonyms: importunity, urgency |
| urial | (noun) bearded reddish sheep of southern Asia | Synonyms: Ovis vignei |
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| uricaciduria | (noun) presence of abnormal amounts of uric acid in the urine; symptom of gout | - |
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| urinal | (noun) a plumbing fixture (usually attached to the wall) used by men to urinate | - |
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| urinalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: uranalysis |
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| urination | (noun) the discharge of urine | Synonyms: micturition |
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| urinator | (noun) a person who urinates | Synonyms: pisser |
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| urine | (noun) liquid excretory product | Synonyms: pee, piddle, piss, water, weewee |
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| urn | (noun) a large vase that usually has a pedestal or feet | - |
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| (noun) a large pot for making coffee or tea | - |
| urobilin | (noun) brown bile pigment formed from urobilinogens and found in feces and in small amounts in urine | - |
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| urobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: stercobilinogen |
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| urocele | (noun) extravasation of urine into the scrotal sac | - |
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| urochesia | (noun) passage of urine from the anus | Synonyms: urochezia |
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| urochezia | (noun) passage of urine from the anus | Synonyms: urochesia |
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| urochord | (noun) a notochord of a larval tunicate typically confined to the caudal region | - |
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| (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochordate |
| urochordate | (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochord |
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| urodele | (noun) amphibians that resemble lizards | Synonyms: caudate |
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| urodynia | (noun) pain during urination | - |
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| urokinase | (noun) protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis | Synonyms: plasminogen activator |
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| urolith | (noun) a urinary stone | - |
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| urologist | (noun) a specialist in urology | - |
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| urology | (noun) the branch of medicine that deals with the diagnosis and treatment of disorders of the urinary tract or urogenital system | Synonyms: urogenital medicine |
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| uropathy | (noun) any pathology of the urinary tract | - |
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| uropygium | (noun) posterior part of a bird's body from which the tail feathers grow | - |
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