/ Thesaurus / P Synonyms of phenobarbitone Find synonyms for: Noun1. sodium thiopental, phenobarbital, phenobarbitone, Luminal, purple heart, barbiturateusage: a long-acting barbiturate used as a sedativeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: bibliophile Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language