| 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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