n.
Pronunciation: ' pir- ˌ ō l
Function: noun
Etymology: Greek pyrrhos
Date: 1835
: a toxic liquid heterocyclic compound C 4 H 5 N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll) broadly : a derivative of pyrrole
– pyr · ro · lic \ pi- ' r ō -lik \ adjective