Styrofoam

[ stahy-ruh-fohm ]
/ ˈstaɪ rəˌfoʊm /

Trademark.

a brand of expanded plastic made from polystyrene.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012