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English definition of “polystyrene”

polystyrene

noun [U]   /ˌpɒlɪˈstaɪriːn/ UK (US trademark Styrofoam)
a light plastic material that is wrapped around delicate objects to protect them, and around hot things to keep them hot: polystyrene packaging/polystyrene cupsPlastics and rubberWrapping, packing and loading
(Definition of polystyrene noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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