Source : Webster's Revised Unabridged Dictionary (1913)

Mesitylene \Me*sit"y*lene\, n. (Chem.)
   A colorless, fragrant liquid, {C6H3(CH3)3}, of the benzene
   series of hydrocarbons, obtained by distilling acetone with
   sulphuric acid. -- {Me*sit`y*len"ic}, a.