/ Dictionary / Index E ethionamide: Meaning and Definition of Find definitions for: eth•i•on•a•mide Pronunciation: (eth"ē-on'u-mīd"), [key] — n. Pharm. an antimicrobial substance, CHNS, used against susceptible Mycobacterium tuberculosis in combination with other drugs in the treatment of any active form of tuberculosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethine Ethiop Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language