[pol-ee-yoor-uh-theyn, -yoo-reth-eyn]
noun Chemistry.
a thermoplastic polymer containing the group NHCOO: used for padding and insulation in furniture, clothing, and packaging, and in the manufacture of resins for adhesives, elastomers, and fillers.
Also, polyurethan [pol-ee-yoor-uh-than] .

1940–45; poly- + urethane

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World English Dictionary
polyurethane or polyurethan (ˌpɒlɪˈjʊərəˌθeɪn, ˌpɒlɪˈjʊərəˌθæn)
a class of synthetic materials made by copolymerizing an isocyanate and a polyhydric alcohol and commonly used as a foam (polyurethane foam) for insulation and packing, as fibres and hard inert coatings, and in a flexible form (polyurethane rubber) for diaphragms and seals
polyurethan or polyurethan

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1944, from poly(mer) + urethane.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
polyurethane   (pŏl'ē-yr'ə-thān')  Pronunciation Key 
Any of various synthetic resins used to make tough resistant coatings, adhesives, foams, and electrical insulation.
The American Heritage® Science Dictionary
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