Breadcrumb Home > Thesaurus > L Synonyms of leucine Find synonyms for: Noun1. leucine, essential amino acidusage: a white crystalline amino acid occurring in proteins that is essential for nutrition; obtained by the hydrolysis of most dietary proteinsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of leucine (Dictionary) ✖ Related Content Daily Word Quiz: restive Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language