From The Collaborative International Dictionary of English v.0.48:

Ketol \Ke"tol\ (k[=e]"t[=o]l), n. [Ketone + indol.] (Chem.)
   One of a series of series of complex nitrogenous substances,
   represented by methyl ketol and related to indol.
   [1913 Webster]

   Methyl ketol, a weak organic base, obtained as a white
      crystalline substance having the odor of feces.
      [1913 Webster]
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