/ Dictionary / Index B barbiturate: Meaning and Definition of Find definitions for: bar•bi•tu•rate Pronunciation: (bär-bich'ur-it, -u-rāt"&wdspcbär"bi-t&oobrever'it, -āt, -ty&oobrever'-), [key] — n. Pharm. any of a group of barbituric acid derivatives, used in medicine as sedatives and hypnotics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: barbiturate (Thesaurus) barbitone barbituric Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language