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piperidine definitions

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Merriam Webster's

noun Etymology: International Scientific Vocabulary piperine + -idine Date: 1854 a toxic liquid heterocyclic base C₅H₁₁N that has a peppery ammoniacal odor and is obtained usually by hydrolysis of piperine

Oxford Reference Dictionary

n. Chem. a peppery-smelling liquid formed by the reduction of pyridine. Etymology: L piper pepper + -IDE + -INE(4)

Webster's 1913 Dictionary

Piperidine Pi*per"i*dine, n. (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.