n.
Pronunciation: ' pr ō - ˌ l ē n
Function: noun
Etymology: German Prolin, contraction of Pyrrolidin pyrrolidine (C 4 H 9 N), from International Scientific Vocabulary pyrrole + -idine
Date: 1904
: an amino acid C 5 H 9 NO 2 that can be synthesized by animals from glutamate