pyrrol

pyr´rol

n.

1.

(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.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.