[pi-roh-li-deen, -din, -rol-i-]
noun Chemistry.
a colorless, water-soluble, unpleasant smelling, poisonous liquid, C 4 H 9 N, from which proline and certain alkaloids are derived, prepared by reducing pyrrole: used chiefly in organic synthesis.

1880–85; pyrrole + -id3 + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrrolidine (pɪˈrɒlɪˌdiːn)
an almost colourless liquid occurring in tobacco leaves and made commercially by hydrogenating pyrrole. It is a strongly alkaline heterocyclic base with molecules that contain a ring of four carbon atoms and one nitrogen atom. Formula: C4H9N

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pyrrolidine pyr·rol·i·dine (pĭ-rŏl'ĭ-dēn')
A nearly colorless liquid pyrrole derivative of pyrrole having an ammonialike odor; it is the basis of proline and hydroxyproline.

The American Heritage® Stedman's Medical Dictionary
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