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WordReference Random House Unabridged Dictionary of American English © 2024xan•thine (zan′thēn, -thin),USA pronunciation n. [Biochem., Chem.]- Biochemistrya crystalline, nitrogenous compound, C5H4N4O2, related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues.
- Biochemistryany derivative of this compound.
- French; see xantho-, -ine2
- 1855–60
Collins Concise English Dictionary © HarperCollins Publishers:: xanthine /ˈzænθiːn -θaɪn/ n - a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C5H4N4O2
- any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics
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