/ Dictionary / Index A acetyl: Meaning and Definition of Find definitions for: a•ce•tyl Pronunciation: (u-sēt'l, u-set'l, as'i-tl), [key] — adj. Chem. containing the acetyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acetyl (Thesaurus) acetum acetylaniline Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language