Real Dictionary

polyurethane
variable noun: Polyurethane is a plastic material used especially to make paint or substances which prevent water or heat from passing through.

polyurethane in American English
any of various synthetic polymers produced by the polymerization of a hydroxyl (OH) radical and an NCO group from two different compounds: used in elastic fibers, cushions, insulation, molded products, coatings, etc.
noun: 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

polyurethane in British English
noun: 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 di