/ Dictionary / Index B barbital: Meaning and Definition of Find definitions for: bar•bi•tal Pronunciation: (bär'bi-tôl", -tal"), [key] — n. Pharm. a barbiturate compound, CONH, formerly used as a hypnotic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: barbital (Thesaurus) Barbirolli barbitalism Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language