/ Dictionary / Index B barbituric acid: Meaning and Definition of Find definitions for: bar'bitu'ric ac'id Pronunciation: [key] a white, crystalline, slightly water-soluble powder, CHNO, used chiefly in the synthesis of barbiturates. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barbituric barbiturism Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language