'Mesityl oxide' definitions:

Definition of 'Mesityl oxide'

From: GCIDE

Mesityl \Mes"i*tyl\, n. (Chem.) A hypothetical radical formerly supposed to exist in mesityl oxide. [1913 Webster]
Mesityl oxide (Chem.), a volatile liquid having the odor of peppermint, obtained by certain dehydrating agents from acetone; -- formerly called also dumasin. [1913 Webster]