/ Dictionary / Index E ethyl mercaptan: Meaning and Definition of Find definitions for: eth'yl mercap'tan Pronunciation: [key] — Chem. Chem. mercaptan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethyl malonate ethyl nitrate Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language