/ Dictionary / Index H herbicide: Meaning and Definition of Find definitions for: herb•i•cide Pronunciation: (hûr'bu-sīd", ûr'-), [key] — n. a substance or preparation for killing plants, esp. weeds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: herbicide (Thesaurus) Herbert herbivore Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language