/ Dictionary / Index I isonicotinic acid hydrazide: Meaning and Definition of Find definitions for: i'so•nic•o•tin'ic ac'id hy'dra•zide Pronunciation: (ī'su-nik"u-tin'ik&wdspchī'dru-zīd", -zid), [key] — Pharm. Pharm. isoniazid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isoniazid isonomy Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language