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Synonyms

Styrofoam

American  
[stahy-ruh-fohm] / ˈstaɪ rəˌfoʊm /
Trademark.
  1. a brand of expanded plastic made from polystyrene.


Styrofoam British  
/ ˈstaɪrəˌfəʊm /

noun

  1. (sometimes not capital) a light, expanded polystyrene plastic

"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

Etymology

Origin of Styrofoam

C20: from polystyrene + foam


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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

A woman, an architect in her 40s holding a Styrofoam lawn-flamingo on a stick, told me she’d come every single day so far.

From Slate ● Sep. 8, 2026

They took down beachside residential towers where wealthier Venezuelans from the nearby capital, Caracas, escaped for weekend getaways, and cheaply constructed low-income high-rises where Styrofoam was used as filler between cement slabs.

From The Wall Street Journal ● Jul. 19, 2026

The cause of the blaze remains unclear but officials said on Friday that Styrofoam placed on the outside of the windows facilitated its rapid spread.

From BBC ● Nov. 28, 2025

There are no discarded once-frozen coffee drinks sweating rings onto wooden tables; no empty Styrofoam takeout containers littering kitchen counters mere inches away from the trash can.

From Los Angeles Times ● Sep. 1, 2025

She’s passing me with a Styrofoam plate full of baby carrots.

From "Landscape with Invisible Hand" by M.T. Anderson

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