from
The Collaborative International Dictionary of English v.0.48
pyrrol \pyr"rol\, pyrrole \pyr"role\, n. [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.
[1913 Webster]