/ Dictionary / Index A alkyl group: Meaning and Definition of Find definitions for: al'kyl group" Pronunciation: [key] — Chem. Chem. any of a series of univalent groups of the general formula CH, derived from aliphatic hydrocarbons, as the methyl group, CH−, or ethyl group, CH−. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alkylation alkyl halide Related Content Daily Word Quiz: bungled Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language