/ Dictionary / Index E ethynyl: Meaning and Definition of Find definitions for: e•thy•nyl Pronunciation: (e-thīn'l), [key] — adj. Chem. containing the ethynyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethyne ethynylation Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language