pyrrole

American  

[pi-rohl, pir-ohl] / pɪˈroʊl, ˈpɪr oʊl /

noun

Chemistry.

1. 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.

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pyrrole British  

/ pɪˈrɒlɪk, ˈpɪrəʊl, pɪˈrəʊl /

noun

1. Also called: azole.  a colourless insoluble toxic liquid having a five-membered ring containing one nitrogen atom, found in many naturally occurring compounds, such as chlorophyll. Formula: C 4 H 5 N

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pyrrole Scientific  

/ pîr′ōl′ /

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: C ₄ H ₅ N.

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Other Word Forms

• pyrrolic adjective

Etymology

Origin of pyrrole

1825–35; irregular < Greek pyrr ( hós ) red + -ole ²

Example Sentences

In this case, a chemical group called a pyrrole-2-carbonyl acts as a rotor that revolves above a stationary group called a phenyl-2-carbonyl.

From Science Magazine