IPA: /ˌpɒliˈaɪsəˌpriːn/
KK: /pɑliˈaɪsəˌpriːn/
A type of polymer made from isoprene, commonly found in natural rubber and some synthetic materials.
Polyisoprene is used in making tires and various rubber products.
Polyisoprene → It is formed from "poly-" (meaning many) and "isoprene" (a compound name derived from the Greek "iso-" meaning equal and "prene" from the Latin "prena" meaning to take). The word "polyisoprene" refers to a polymer made from many isoprene units.
Think of 'many' ('poly-') isoprene units coming together to form a larger structure — that's what polyisoprene is.