poly-isoprene

polyisoprene

[pol-ee-ahy-suh-preen]
noun Chemistry.
a thermoplastic polymer, (C 5 H 8 ) n , the major constituent of natural rubber and also obtained synthetically.

Origin:
1930–35; poly- + isoprene

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World English Dictionary
polyisoprene (ˌpɒlɪˈaɪsəˌpriːn)
 
n
any of various polymeric forms of isoprene, occurring in rubbers

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