/ Dictionary / Index M mesityl oxide: Meaning and Definition of Find definitions for: mes'i•tyl ox'ide Pronunciation: (mez'i-til, mes'-), [key] — Chem. Chem. an oily, colorless liquid, CHO, having a honeylike odor: used chiefly as a solvent and in the manufacture of synthetic organic compounds. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesitylene Mesmer Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language