Definition of polyfoam in English:

polyfoam

Pronunciation /ˈpɒlɪfəʊm/

noun

  • Any of various synthetic polymeric compounds with a cellular structure, used for purposes such as padding, upholstery, or insulation; especially foam plastic or polystyrene. Frequently attributive, as "polyfoam box", "polyfoam cushion", etc.

    A trademark in the United Kingdom.

Origin

1950s; earliest use found in The Trade Marks Journal. From poly- + foam.