What is "polypyrrole"

n. (context chemistry English) Any of a class of electrically conducting polymers whose repeat unit is a pyrrole

Polypyrrole (PPy) is a type of organic polymer formed by polymerization of pyrrole. Polypyrroles are conducting polymers, related members being polythiophene, polyaniline, and polyacetylene. The Nobel Prize in Chemistry was awarded in 2000 for work on conductive polymers including polypyrrole.