Etymology
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polyurethane (n.)

type of synthetic resin or plastic made from polymers, 1944, from polymer + urethane.

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Definitions of polyurethane

polyurethane (n.)
any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber;
Synonyms: polyurethan
From wordnet.princeton.edu