Breadcrumb Home > Thesaurus > P Synonyms of placidyl Find synonyms for: Noun1. ethchlorvynol, Placidyl, sedative-hypnotic, sedative-hypnotic drugusage: a mild sedative-hypnotic drug (trade name Placidyl)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of placidyl (Dictionary) ✖ Related Content Daily Word Quiz: sepulture Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language