[pi-per-i-deen, -din, pahy-, pip-er-i-]
noun Chemistry.
a colorless, water-soluble liquid, C 5 H 1 1 N, obtained from the alkaloid piperine or from pyridine: used chiefly as a solvent.

1850–55; < Latin piper pepper + -id3 + -ine1

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World English Dictionary
piperidine (pɪˈpɛrɪˌdiːn, -dɪn)
a colourless liquid heterocyclic compound with a peppery ammoniacal odour: used in making rubbers and curing epoxy resins. Formula: C5H11N

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American Heritage
Medical Dictionary

piperidine pi·per·i·dine (pī-pěr'ĭ-dēn', pĭ-)
A strongly basic, colorless liquid from which certain phenothiazine antipsychotics are derived.

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