/ Thesaurus / F Synonyms of flexeril Find synonyms for: Noun1. cyclobenzaprine, Flexeril, muscle relaxantusage: muscle relaxant (trade name Flexeril) used for muscle spasms or acute injuryWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language