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From The Collaborative International Dictionary of English v.0.44 [gcide]:
pyrrol \pyr"rol\, pyrrole \pyr"role\, noun [Gr. ? flame-colored (from ? fire) + L. oleum oil.] (Chem.) A nitrogenous heterocyclic base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, {C4H5N}, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red.
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