pol ‧ y ‧ u ‧ re ‧ thane /ˌpɒlɪˈjʊərəθeɪn, ˌpɒlɪˈjʊərɪθeɪn $ ˌpɑːlɪˈjʊr-/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Origin: poly- + urethane type of chemical compound (19-21 centuries) (from Latin urea substance found in urine) ]
a plastic used to make paints and ↑ varnish