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
Officials are also investigating whether flammable materials, including polystyrene boards blocking several apartment windows, contributed to the disaster.
—
Alexandra Banner, CNN Money, 1 Dec. 2025
It’s made from high-density polystyrene, a waterproof and weather-resistant material that’s built to last through intense UV rays, rain, and snow.
—Alicia Geigel, Southern Living, 1 Dec. 2025
The eight buildings of the Wang Fuk Court complex in the suburb of Tai Po had all been clad in bamboo scaffolding draped with nylon netting for renovations, with windows covered by polystyrene panels.
—CBS News, 30 Nov. 2025
The program, called Snow Secure, involves placing polystyrene panels over large snow piles in the summer.
—Rose Evans, Idaho Statesman, 28 Nov. 2025
See All Example Sentences for polystyrene
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Alexandra Banner, CNN Money, 1 Dec. 2025
It’s made from high-density polystyrene, a waterproof and weather-resistant material that’s built to last through intense UV rays, rain, and snow.
—Alicia Geigel, Southern Living, 1 Dec. 2025
The eight buildings of the Wang Fuk Court complex in the suburb of Tai Po had all been clad in bamboo scaffolding draped with nylon netting for renovations, with windows covered by polystyrene panels.
—CBS News, 30 Nov. 2025
The program, called Snow Secure, involves placing polystyrene panels over large snow piles in the summer.
—Rose Evans, Idaho Statesman, 28 Nov. 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 7 Dec. 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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