/ Dictionary / Index E ethylene group: Meaning and Definition of Find definitions for: eth'ylene group" Pronunciation: [key] — Chem. Chem. the bivalent group, −CH−, derived from ethylene or ethane. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethylene glycol ethylene oxide Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language