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n :  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 adj 
Similar sounding terms:  pa·role  pa·rol·ee  pearl  perle 

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