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

 

polystyrene

 noun
noun
BrE BrE//ˌpɒliˈstaɪriːn//
 
; NAmE NAmE//ˌpɑːliˈstaɪriːn//
 
(also Styrofoam™ especially in North American English)[uncountable]
 
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a very light soft plastic that is usually white, used especially for making containers that prevent heat loss. polystyrene cups
See the Oxford Advanced American Dictionary entry: polystyrene

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