/ Dictionary / Index A alkyl halide: Meaning and Definition of Find definitions for: al'kyl hal'ide Pronunciation: [key] — Chem. Chem. a compound with the type formula RX, where R is an alkyl group and X is a halogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alkyl group alkylic Related Content Daily Word Quiz: pudgy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language