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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]