Polystyrene (Noun)
Syllable division: poly·​sty·​rene
How to pronounce: UK: /ˌpɒl.ɪˈstaɪ.riːn/ US: /ˌpɑː.lɪˈstaɪ.riːn/

British VS American Pronunciation of the word Polystyrene

Meaning: A thin, typically white plastic that is used to enclose things to reduce heat loss or to protect delicate goods from injury when they are placed within containers.
Example:
> When we pack for a picnic, we usually pack polystyrene cups.
> Most restaurants pack doggy bags in polystyrene containers. 

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