Definition of expanded polystyrene noun from the Oxford Advanced Learner's Dictionary

 

expanded polystyrene

 noun
noun
BrE
 
; NAmE
 
(also Styrofoam™ especially in North American English)[uncountable]
 
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a form of polystyrene used for protecting objects in packages and for stopping heat, noise, etc. from escaping
See the Oxford Advanced American Dictionary entry: expanded polystyrene