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Definition of expanded polystyrene noun from the Oxford Advanced Learner's Dictionary

expanded polystyrene

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