What is "mesityl oxide"

Mesityl \Mes"i*tyl\, n. (Chem.) A hypothetical radical formerly supposed to exist in mesityl oxide.

Mesityl oxide (Chem.), a volatile liquid having the odor of peppermint, obtained by certain dehydrating agents from acetone; -- formerly called also dumasin.

n. (context chemistry English) An α,β-unsaturated ketone, a colourless volatile liquid with a strong peppermint odour.

Mesityl oxide is a α,β-Unsaturated ketone with the formula CHC(O)CH=C(CH). This compound is a colorless, volatile liquid with a strong cat urine odor.