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1. A five-membered heterocyclic ring compound, C4H5N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.
2. Any of various derivatives of this compound.

[Greek purros, red (from pūr, fire; see pyre) + -ole.]

pyr·ro′lic (pĭ-rō′lĭk) adj.


(ˈpɪrəʊl; pɪˈrəʊl)
(Elements & Compounds) 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
[C19: from Greek purrhos red, from pur fire +-ole1]
pyrrolic adj


(pɪˈroʊl, ˈpɪr oʊl)

a colorless, toxic, liquid, five-membered ring compound, C4H5N, that is a component of chlorophyll and hemin.
[1825–35; < Greek pyrr(hós) red]
pyr•rol•ic (pɪˈrɒl ɪk, -ˈroʊ lɪk) adj.
References in periodicals archive ?
The major part of the products formed at strong oxidation of kerogen is usually carboxylic acids with perhaps smaller amounts of hydrocarbons, terpenes, pyrole resins, tannin, pigments etc.
1),(2) These infections in teeth or bones under leaking root canals are home to some of the most toxic bacteria known and secret thioethers and mercaptans, indoles, pyroles, scatoles and other extremely toxic, sulfur compounds that suppress phosphorylase enzymes which deplete ATP production in our mitochondria and are likened to turning down the volume on the TV.