(organic chemistry) Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and a nitrogen atom; especially the simplest one, C₄H₅N.

plural of pyrrole

(dated) Alternative spelling of pyrrole

(organic chemistry) Pertaining to, or having a structure based on, a pyrrole

plural of pyrrol

(organic chemistry) Any of three isomeric monounsaturated heterocycles having a five-membered ring and one nitrogen atom C₄H₇N; any derivative of these compounds

(chemistry) any of a class of heterocyclic ketones derived from a pyrrolidine; especially 2-pyrrolidone, the simplest γ-lactam

(organic chemistry) Any of a class of heterocyclic amines having a saturated five-membered ring; especially the parent compound of this class, C₄H₉N.

plural of pyrroline

plural of pyrrolidone