Meaning of polyisobutylene

pol•y•i•so•bu•tyl•ene

Pronunciation: (pol"ē-ī"su-byt'l-ēn"), [key]
— n. Chem.
  1. a polymer of isobutylene, used chiefly in the manufacture of synthetic rubber.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.