| 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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| ursinia | (noun) any of various plants of the genus Ursinia grown for their yellow- or orange- or white-rayed flowers | - |
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| urticaria | (noun) an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs | Synonyms: hives, nettle rash, urtication |
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| urtication | (noun) a sensation of having been stung by nettles | - |
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| (noun) an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs | Synonyms: hives, nettle rash, urticaria |
| urus | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: aurochs, Bos primigenius |
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