/ Dictionary / Index M maleic hydrazide: Meaning and Definition of Find definitions for: male'ic hy'drazide Pronunciation: (hī'dru-zīd"), [key] — Chem. Chem. a crystalline compound, CNHO, used as a plant growth inhibitor and weed-killer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. maleic anhydride male menopause Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language