From The Collaborative International Dictionary of English v.0.48:

acetone \ac"e*tone\ ([a^]s"[-e]*t[=o]n), n. [See Acetic.]
   A volatile liquid (CH3.CO.CH3); pyroacetic spirit; methyl
   ketone; -- obtained by fermentation, the distillation of
   certain acetates, or by the destructive distillation of
   citric acid, starch, sugar, or gum, with quicklime. It is
   commonly used as a solvent.
   [1913 Webster +PJC]

   Note: The term was once also applied to a number of bodies of
         similar constitution, more frequently called ketones.
         See Ketone.
         [1913 Webster +PJC]
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