/ Dictionary / Index M methyl isobutyl ketone: Meaning and Definition of Find definitions for: meth'yl isobu'tyl ke'tone Pronunciation: [key] a colorless, slightly water-soluble, flammable liquid, CHO, having a pleasant odor: used as a solvent for nitrocellulose, gums, resins, fats, waxes, and oils. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methylisobutenyl ketone methyl isocyanate Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language