Meaning of polyisoprene

pol•y•i•so•prene

Pronunciation: (pol"ē-ī'su-prēn"), [key]
— n. Chem.
  1. a thermoplastic polymer, (CH), the major constituent of natural rubber and also obtained synthetically.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.