/ Dictionary / Index A allyl: Meaning and Definition of Find definitions for: al•lyl Pronunciation: (al'il), [key] — Chem. Chem. —adj. containing the allyl group. —n. the allyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: allyl (Thesaurus) all-year allyl alcohol 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