| 单词 | xanthine |
| 释义 | Word Frequency xanthine(ˈzænθiːn, -θaɪn) noun 1. 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 |
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