Breadcrumb Home > Thesaurus > C Synonyms of cystine Find synonyms for: Noun 1. cystine, amino acid, aminoalkanoic acid usage: a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of cystine (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