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Styrofoam

[stahy-ruh-fohm]
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Trademark.
  1. 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. 2018

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British Dictionary definitions for styrofoam

Styrofoam

noun
  1. trademark (sometimes not capital) a light, expanded polystyrene plastic
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Word Origin

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

Word Origin and History for styrofoam

Styrofoam

n.

1950, trademark name (Dow Chemical Co.), from (poly)styr(ene) (see polystyrene) + -o- + foam (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper