Styrofoam

[ stahy-ruh-fohm ]

/ ˈstaɪ rəˌfoʊm /

Trademark.

a brand of expanded plastic made from polystyrene.

RELATED WORDS

filling, stuffing, wadding

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for styrofoam

All meals are packed (abundantly) into Styrofoam containers and bagged with plastic utensils.
The Heart and Soul (Food) of Orlando|Jane & Michael Stern|June 8, 2014|DAILY BEAST
The man who kindly made my meal in less than three minutes opened the styrofoam container and pointed: “Only lemons.”
Limepocalypse! Inside the Great Lime Shortage of 2014|Kara Cutruzzula|April 30, 2014|DAILY BEAST
School-age children with rumbling tummies move their styrofoam trays in an orderly lunch line.
The Schools That Starve Students to Punish Deadbeat Parents|Brandy Zadrozny|January 30, 2014|DAILY BEAST
According to The Daily Mail, a 40-foot styrofoam replica of Westwood was supposed to be on view, but Wintour ruled against it.
Jennifer Lawrence Gets ‘Chopped’; Viktor & Rolf Return to Couture|The Fashion Beast Team|April 22, 2013|DAILY BEAST

The tsunami debris is different, not just because it comes from Japan, but because it includes “a huge amount of Styrofoam.”
As Japan’s Tsunami Debris Arrives, Can U.S. West Coast Handle It?|Winston Ross|September 7, 2012|DAILY BEAST

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