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in the PONS Dictionary

I. poly·sty·rene [ˌpɒlɪˈstaɪ(ə)ri:n] Brit, Aus N no pl

polystyrene
Styropor®nt<-s>

II. poly·sty·rene [ˌpɒlɪˈstaɪ(ə)ri:n] Brit, Aus N modifier

polystyrene
Styropor-
polystyrene chips
Styroporschnitzel pl
polystyrene insulation tile
Isolierplatte f aus Styropor

ex·pand·ed poly·sty·rene [ɪkˈspændɪd, ek-] N no pl CHEM

expanded polystyrene
schaumfähiges Polystyrol spec

po·ly·sty·rene chips N pl

polystyrene chips
Styroporflocken pl