Breadcrumb Home > Dictionary > Index I isoniazid: Meaning and Definition of Find definitions for: i•so•ni•a•zid Pronunciation: (ī"su-nī'u-zid), [key] — n. Pharm. a white, crystalline, water-soluble solid, CHNO, used in the treatment of tuberculosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: isoniazid (Thesaurus) isoneph isonicotinic acid hydrazide TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census 50 Spookiest Halloween Quotes Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: effete Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language