Webster’s Revised Unabridged Dictionary · 1913
Mesitylene
Me·sit′y·lene (mē·sĭt′ĭ·lēn), 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.