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[pi-rohl, pir-ohl] /pɪˈroʊl, ˈpɪr oʊl/
noun, Chemistry.
a colorless, toxic, liquid, five-membered ring compound, C 4 H 5 N, that is a component of chlorophyll, hemin, and many other important naturally occurring substances.
Origin of pyrrole
1825-35; irregular < Greek pyrr(hós) red + -ole2
Related forms
[pi-rol-ik, -roh-lik] /pɪˈrɒl ɪk, -ˈroʊ lɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for pyrrole


/ˈpɪrəʊl; pɪˈrəʊl/
a colourless insoluble toxic liquid having a five-membered ring containing one nitrogen atom, found in many naturally occurring compounds, such as chlorophyll. Formula: C4H5N Also called azole
Derived Forms
pyrrolic (pɪˈrɒlɪk) adjective
Word Origin
C19: from Greek purrhos red, from pur fire +-ole1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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pyrrole in Medicine

pyrrole pyr·role (pēr'ōl')
A five-membered heterocyclic ring compound that has an odor similar to chloroform and is the parent compound of hemoglobin, chlorophyll, and many other complex, biologically active substances. Also called imidole.

pyr·ro'lic (pĭ-rō'lĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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pyrrole in Science
  1. Any of a class of organic compounds having a five-member ring composed of four carbon atoms and one nitrogen atom. The pyrrole ring structure is a component of many biologically important compounds, including porphyrins, alkaloids, and certain amino acids.

  2. The simplest of this class of compounds, in which a single hydrogen atom is attached to each atom in the ring. It has a pleasant odor similar to that of chloroform. Chemical formula: C4H5N.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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