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|n.||1.||(Chem.) Any one of several metameric alkaloids, C5H3N.(CH3)2, of the pyridine series, obtained from bone oil as liquids, and having peculiar pungent odors. These alkaloids are also called respectively dimethyl pyridine, ethyl pyridine, etc.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.