/ Dictionary / Index E ethal: Meaning and Definition of Find definitions for: eth•al Pronunciation: (eth'al, ē'thal), [key] — n. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethacrynic acid ethambutol Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language