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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:

“There is still Styrofoam stuff sold in 250 Smart and Final stores across the state!” she said.

From Los Angeles Times Feb. 27, 2026

She then reached for a Styrofoam mannequin’s head that was on a shelf in the closet.

From Slate Nov. 15, 2025

On blustery afternoons, my street’s geography sends every scrap of airborne litter to my curb: candy wrappers, Styrofoam peanuts and Trader Joe’s receipts that reveal too much about the neighbors’ taquitos intake.

From The Wall Street Journal Oct. 8, 2025

He discovered the mystery blobs one day last month, initially thinking it looked like Styrofoam.

From BBC Oct. 12, 2024

We joined other new officers in the mess hall, where I held a tray and Bella stacked it high with Styrofoam “clamshells” full of beef stew and rice.

From "Newjack: Guarding Sing Sing" by Ted Conover

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