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English definition of “polystyrene”

polystyrene

noun [U] uk   /ˌpɒl.ɪˈstaɪ.riːn/ us    /ˌpɑː.lɪˈstaɪ-/ (US usually trademark Styrofoam)
a light, usually white plastic used especially for putting around delicate objects inside containers to protect them from damage, or for putting around something to prevent it from losing heat: polystyrene cups/plates The ceiling was covered with polystyrene insulation tiles.
(Definition of polystyrene from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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