/ Dictionary / Index M methyl red: Meaning and Definition of Find definitions for: meth'yl red' Pronunciation: [key] a water-insoluble solid occurring as a dark-red powder or violet crystals, CHNO, used chiefly as an acid-base indicator. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methyl propyl ketone methylrosaniline chloride 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