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 (such as bile pigments, porphyrins, and chlorophyll)
broadly
: a derivative of pyrrole
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Merriam-Webster unabridged
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Time Traveler for pyrrole
The first known use of pyrrole was in 1835
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