noun \ˈpi(ə)r-ˌōl\

Definition of PYRROLE

: a toxic liquid heterocyclic compound C4H5N 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 \pir-ˈō-lik\ adjective

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