/ Dictionary / Index M mesitylene: Meaning and Definition of Find definitions for: me•sit•y•lene Pronunciation: (mi-sit'l-ēn", mes'i-tl-), [key] — n. Chem. a colorless, liquid, aromatic hydrocarbon, CH, occurring naturally in coal tar and prepared from acetone: used chiefly as a chemical intermediate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mesic mesityl oxide Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language