noun
: a white odorless tasteless nearly insoluble dibasic acid C 5 H 4 N 4 O 3 that is present in small quantity in the urine of man and most mammals and abundantly in the form of urates in the excrement of birds, reptiles, and invertebrates in whom it constitutes the chief nitrogenous excretion product, that is a common component either as the free acid or as a urate of urinary or renal calculi and of the so-called gouty concretions, and that is capable of being made synthetically; 2,6,8-trihydroxy-purine