a white, odorless, crystalline substance, CHNO, found in urine, the excreta of birds and reptiles, etc.: it is slightly soluble in water
See uric acid in American Heritage Dictionary 4
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.