Definition of polystyrene noun from the Oxford Advanced American Dictionary

 

polystyrene

 noun
noun
NAmE//ˌpɑliˈstaɪrin//
 
(also Styrofoam™)[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 Learner's Dictionary entry: polystyrene

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