noun[mass noun] Chemistry
A weakly basic sweet-smelling liquid compound present in coal tar.
- This step is followed by polymerising pyrrole vapours to produce a foam composite.
- The free-base form of such porphyrins contains two pyrrole nitrogens.
- The Netropsin ligand consists of a guanidinium, two pyrrole, and a propylamidinium part.
Mid 19th century: from Greek purrhos 'reddish' + Latin oleum 'oil'.
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