polystyrene
noun
poly·sty·rene
ˌpä-lē-ˈstī-ˌrēn 
: a polymer of styrene
especially
: a rigid transparent thermoplastic that has good physical and electrical insulating properties and is used especially in molded products, foams, and sheet materials
Examples of polystyrene in a Sentence
Recent Examples on the Web
The symbol included a No. 6 in the center, indicating the material is polystyrene.
—
Los Angeles Times, 11 July 2025
It’s crafted from high-impact polystyrene that is designed to withstand different weather conditions, including snow, rain, intense sun, and wind without warping, fading, or splintering.
—Maggie Horton, People.com, 28 June 2025
The institute — whose board members include or have included representatives from the chemical giant BASF Corp., polystyrene manufacturer Dart Container, Eastman Chemical Co. and PepsiCo — is lobbying the federal and state government to get its products into the compost stream.
—Los Angeles Times, 4 July 2025
Those patterns were embossed into the surface of flat polystyrene chips, which were subsequently inoculated with Pseudomonas aeruginosa and other types of bacteria.
—New Atlas, 25 June 2025
See All Example Sentences for polystyrene
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Los Angeles Times, 11 July 2025
It’s crafted from high-impact polystyrene that is designed to withstand different weather conditions, including snow, rain, intense sun, and wind without warping, fading, or splintering.
—Maggie Horton, People.com, 28 June 2025
The institute — whose board members include or have included representatives from the chemical giant BASF Corp., polystyrene manufacturer Dart Container, Eastman Chemical Co. and PepsiCo — is lobbying the federal and state government to get its products into the compost stream.
—Los Angeles Times, 4 July 2025
Those patterns were embossed into the surface of flat polystyrene chips, which were subsequently inoculated with Pseudomonas aeruginosa and other types of bacteria.
—New Atlas, 25 June 2025
See All Example Sentences for polystyrene
Cite this Entry
“Polystyrene.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polystyrene. Accessed 22 Jul. 2025.
Copy CitationKids Definition
polystyrene
noun
poly·sty·rene
ˌpäl-i-ˈstī(ə)r-ˌēn
: a stiff transparent plastic used chiefly in molded products, foams, and sheet materials
Medical Definition
polystyrene
noun
poly·sty·rene
ˌpäl-i-ˈstī(ə)r-ˌēn
: a polymer of styrene
especially
: a rigid transparent thermoplastic that has good physical and electrical insulating properties and is used especially in molded products, foams, and sheet materials
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