Source : Webster's Revised Unabridged Dictionary (1913)

Metacetone \Me*tac"e*tone\, n. [Pref. met- + acetone.] (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.