expanded polystyrene
noun/ɪkˌspændɪd ˌpɒliˈstaɪriːn/
/ɪkˌspændɪd ˌpɑːliˈstaɪriːn/
(also Styrofoam™ especially in North American English)
[uncountable]- a form of polystyrene used for protecting objects in packages and for stopping heat, noise, etc. from escaping
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expanded polystyrene