/ Dictionary / Index P pesticide: Meaning and Definition of Find definitions for: pes•ti•cide Pronunciation: (pes'tu-sīd"), [key] — n. a chemical preparation for destroying plant, fungal, or animal pests. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pesticide (Thesaurus) pesthouse pestiferous Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language