Dictionary![]() ![]() bar•bi•tu•ratePronunciation: (bär-bich'ur-it, -u-rāt"; bär"bi-toor'it, -āt, -tyoor'-), [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.
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