/ Dictionary / Index M methylheptenone: Meaning and Definition of Find definitions for: meth•yl•hep•te•none Pronunciation: (meth"ul-hep'tu-nōn"), [key] — n. Chem. a colorless liquid, CHO, occurring in many essential oils and produced by synthesis: used in organic synthesis and in the manufacture of inexpensive perfumes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. methyl group methylic Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language