• Webster's Revised Unabridged Dictionary
    • n pyrrol (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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Century Dictionary and Cyclopedia
    • n pyrrol A secondary amine (C4H5N) of feebly basic character and heterocyclic structure. It is a colorless liquid of chloroform-like odor which boils at 131° C., and turns brown on exposure to the air. It occurs in coal-tar and in Dippel's animal oil or bone-oil. The name was given because of the fiery red color produced by this substance when brought in contact with a pine-shaving moistened with hydrochloric acid.
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Webster's Revised Unabridged Dictionary
Gr. flame-colored (from fire) + L. ol,eum oil


In literature:

The compound, or compounds, known as "caffetannic acid" are probably the source of catechol, as the proteins are of ammonia, amins, and pyrrols.
"All About Coffee" by William H. Ukers
It gives the pine-shaving reaction, in this respect resembling pyrrol (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various