: a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (such as bile pigments, porphyrins, and chlorophyll)
broadly
: a derivative of pyrrole
Examples of pyrrole in a Sentence
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Because of the way the sensor works, it can be adapted to detect pyrrole, a compound found in marijuana.
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Teresa Nowakowski, Smithsonian Magazine, 24 Apr. 2023
Researchers were able to contest the authenticity of the works by proving pigments used in the paintings, like the lightfast pyrrole red, PR 254, had not even been discovered until after Pollock’s death in 1956.
—Jackie Mansky, Smithsonian, 14 Mar. 2018
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Teresa Nowakowski, Smithsonian Magazine, 24 Apr. 2023
Researchers were able to contest the authenticity of the works by proving pigments used in the paintings, like the lightfast pyrrole red, PR 254, had not even been discovered until after Pollock’s death in 1956.
—Jackie Mansky, Smithsonian, 14 Mar. 2018
Cite this Entry
“Pyrrole.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyrrole. Accessed 13 Jul. 2025.
Copy CitationMedical Definition
pyrrole
noun
pyr·role
ˈpi(ə)r-ˌōl 
: a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important substances (as bile pigments, porphyrins, and chlorophyll)
broadly
: a derivative of pyrrole
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