/ Dictionary / Index M methyl propyl ketone: Meaning and Definition of Find definitions for: meth'yl pro'pyl ke'tone Pronunciation: [key] a colorless, slightly water-soluble liquid, CHO, used chiefly as a solvent, esp. in lacquers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methyl phenyl ether methyl red 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