Breadcrumb Home > Thesaurus Cite Synonyms of methionine Find synonyms for: Noun1. methionine, essential amino acidusage: a crystalline amino acid containing sulfur; found in most proteins and essential for nutritionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: methionine (Dictionary) Related Content Daily Word Quiz: erpsichore Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index