noun
: any of a group of crystalline bases comprising purine and bases derived from it (as adenine, caffeine, guanine, theobromine, or xanthine) some of which are components of nucleosides and nucleotides
noun
: any of a group of crystalline bases comprising purine and bases derived from it (as adenine, caffeine, guanine, theobromine, or xanthine) some of which are components of nucleosides and nucleotides
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012