pyrrols
plural of pyrrol
Source: Wiktionary
Pyr"rol, n. Etym: [Gr. oleum oil.] (Chem.)
Definition: A nitrogenous 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.
Source: Webster’s Unabridged Dictionary 1913 Edition
5 June 2025
(verb) raise or support (the level of printing) by inserting a piece of paper or cardboard under the type; “underlay the plate”
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