/ Dictionary / Index D diacetyl: Meaning and Definition of Find definitions for: di•a•ce•tyl Pronunciation: (dī"u-sēt'l, -set'l, dī-as'i-tl), [key] — n. Chem. biacetyl. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diacetone alcohol diacetylmorphine Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language