/ Dictionary / Index P paraquat: Meaning and Definition of Find definitions for: par•a•quat Pronunciation: (par'u-kwät"), [key] — n. Chem. a toxic herbicide, CHN&multiplydot;2CHSO, applied to food and flower crops and to highway borders as a defoliant and weed-killer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: paraquat (Thesaurus) parapsychology paraquet Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language