Breadcrumb Home > Thesaurus > X Synonyms of xanthine Find synonyms for: Noun 1. xanthine, organic compound usage: crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of xanthine (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language