/ Dictionary / Index B biacetyl: Meaning and Definition of Find definitions for: bi•a•ce•tyl Pronunciation: (bī"u-sēt'l, -set'l, bī-as'i-tl), [key] — n. Chem. a yellow, water-soluble liquid, CHO, occurring in butter and in certain essential oils, as bay, and also synthesized: used chiefly to augment the flavor and odor of vinegar, coffee, and other foods. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bia Biafra Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language