| 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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| uremic | (adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency) | Synonyms: azotemic, uraemic |
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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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| urethral | (adjective) of or relating to the urethra | - |
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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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