Pyrrol

noun

1. A secondary amine (C4H5N) of feebly basic character and heterocyclic structure.
2. 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.
3. Alternative spelling of pyrrole.