pyrrolePronunciation: /ˈpɪrəʊl/Definition of pyrrole noun [mass noun] Chemistry a weakly basic sweet-smelling liquid compound present in coal tar. A heteroaromatic compound; chemical formula: C4H4NH Origin: mid 19th century: from Greek purrhos 'reddish' + Latin oleum 'oil'pyrrole in other Oxford dictionaries Definition of pyrrole in the US English dictionary
