a colorless, liquid hydrocarbon, (CH)NH, found in many alkaloids and obtained by reducing pyridine or by treating piperine with alkali: used in making rubber, oils, fuels, etc.
See piperidine in American Heritage Dictionary 4
(pī-pĕrˈĭ-dēnˌ, pĭ-)
noun
A strongly basic, colorless liquid, C5H10NH, used in the manufacture of rubber and as a curing agent in epoxy resins.