a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C5H4N4O2
2.
any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics
xanthine in American English
(ˈzænˌθin; ˈzænθɪn)
noun
1.
a white, crystalline, nitrogenous compound, C5H4N4O2, resembling uric acid: it is present in blood, urine, and certain plants