metacetone

from The Century Dictionary.

• noun A substance (C₆H₁₀O) obtained by acting on acetone with sulphuric or hydrochloric acid. It is a colorless liquid having an odor of peppermint. Also called mesityl oxid.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A colorless liquid of an agreeable odor, C6H10O, obtained by distilling a mixture of sugar and lime; -- so called because formerly regarded as a polymeric modification of acetone.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry C6H10O, a colourless liquid obtained by distilling a mixture of sugar and lime.