mesityloxide

mes·i·tyl oxide (mĕsʹĭ-tĭl) n.

An oily liquid, (CH₃)₂C:CHCOCH₃, obtained from acetones and used as a solvent and in lacquers, paints, and varnishes.

  [Greek mesītēs, mediator (from its use as an intermediate in organic synthesis) (from mesos, middle. See meso-) + -yl.]

* * *