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Definition of: pyrrole
(pi·rōl′, pir′ōl) noun Chem.
A colorless, poisonous, weakly basic, liquid compound, C4H4NH, having an odor of chloroform, obtained from bone oil, coal tar, and by synthesis, and occurring in many natural substances, as chlorophyll and hemoglobin. Also pyr·rol′. [<G pyrrol (<Gk. pyrros reddish <pyr fire) + -ol- OLE1]
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