/ Dictionary / Index M methiocarb: Meaning and Definition of Find definitions for: me•thi•o•carb Pronunciation: (me-thī'u-kärb"), [key] — n. Chem. a crystalline compound, CHNOS, used as a nonsystemic insecticide and miticide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methinks methionine Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language