Styrofoam

[ stahy-ruh-fohm ]
/ ˈstaɪ rəˌfoʊm /

Trademark.

a brand of expanded plastic made from polystyrene.

Example sentences from the Web for styrofoam

British Dictionary definitions for styrofoam

Styrofoam
/ (ˈstaɪrəˌfəʊm) /

noun

trademark (sometimes not capital) a light, expanded polystyrene plastic

Word Origin for Styrofoam

C20: from polystyrene + foam