from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A semisolid compound, C5H4N4O3, that is a nitrogenous end product of protein and purine metabolism and is the chief nitrogenous component of the urine in birds, terrestrial reptiles, and insects.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry a bicyclic heterocyclic phenolic compound, formed in the body by the metabolism of protein and excreted in the urine (or in avian faeces)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a white tasteless odorless crystalline product of protein metabolism; found in the blood and urine


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