/ Dictionary / Index M methyl parathion: Meaning and Definition of Find definitions for: meth'yl parathi'on Pronunciation: [key] a synthetic pesticide, CHNOPS, used in the control of mites and various insects, as aphids, boll weevils, and cutworms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methylparaben methylphenidate Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language