/ Dictionary / Index A allyl group: Meaning and Definition of Find definitions for: al'lyl group" Pronunciation: [key] — Chem. Chem. the univalent group CH, derived from propylene. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. allyl chloride allylic Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language