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Webster 1913 Edition
pyrrole
pyr′rol
,pyr′role
Noun.
[Gr. [GREEK] flame-colored (from [GREEK] fire) + L.
ol
eum 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.