/ Dictionary / Index D diacetylmorphine: Meaning and Definition of Find definitions for: di•a•ce•tyl•mor•phine Pronunciation: (dī"u-sēt"l môr'fēn, -set"-, dī-as"i-tl-), [key] — n. Pharm. heroin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diacetylmorphine (Thesaurus) diacetyl diachronic 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