/ Thesaurus / M Synonyms of meperidine hydrochloride Find synonyms for: Noun1. meperidine, meperidine hydrochloride, Demerol, narcoticusage: a synthetic narcotic drug (trade name Demerol) used to treat painWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language