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polystyrene noun
/ˌpɒl.ɪˈstaɪə .riːn/
/ˌpɑː.lɪˈstaɪ-/ n [U] (US usually trademark Styrofoam) Definition
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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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