Styrofoam

Styrofoam

[stahy-ruh-fohm]
Trademark.
a brand of expanded plastic made from polystyrene.
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World English Dictionary
Styrofoam (ˈstaɪrəˌfəʊm)
 
n
(sometimes not capital) trademark a light, expanded polystyrene plastic
 
[C20: from polystyrene + foam]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

Styrofoam
1950, trademark name (Dow Chemical Co.), from (poly)styr(ene) (see polystyrene) + -o- + foam (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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