/ Dictionary / Index M methylisobutenyl ketone: Meaning and Definition of Find definitions for: meth'yl•i•so•bu'te•nyl ke'tone Pronunciation: (meth'ul-ī"sō-byt'n-il, meth"-), [key] — Chem. Chem. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methylidyne group methyl isobutyl ketone 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