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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.
/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

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.


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