/ Dictionary / Index M methylparaben: Meaning and Definition of Find definitions for: meth•yl•par•a•ben Pronunciation: (meth"ul-par'u-ben"), [key] — n. Chem. a fine, white, needlelike substance, CHO, used chiefly as a preservative in foods and pharmaceuticals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methyl orange methyl parathion Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language