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Webster 1913 Edition

Noun.

(Chem.)

An oily liquid alkaloid,

C5H11N

, having a hot, peppery, ammoniacal odor. It is related to pyridine, and is obtained by the decomposition of piperine.

See also: pipéridine

piperidine ‎(plural piperidines)

(organic chemistry) An alicyclic heterocycle, containing 5 carbon atoms and one nitrogen atom, formally derived by the hydrogenation of pyridine; many of its derivatives are alkaloids or pharmaceuticals