polyisoprene

[ pol-ee-ahy-suh-preen ]
/ ˌpɒl iˈaɪ səˌprin /

noun Chemistry.

a thermoplastic polymer, (C5H8)n, the major constituent of natural rubber and also obtained synthetically.

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Origin of polyisoprene

First recorded in 1930–35; poly- + isoprene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for polyisoprene

polyisoprene
/ (ˌpɒlɪˈaɪsəˌpriːn) /

noun

any of various polymeric forms of isoprene, occurring in rubbers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012