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
Thankfully, legislators in the Illinois legislature are working hard to phase out polystyrene foam, one of the worst kinds of single-use plastic.
—
Chicago Tribune, 18 May 2025
Product Details: Cover Material: Stain-resistant, water-resistant fabric | Fill: Recyclable polystyrene beans | Care: Spot-clean | Product Weight: 4.75 lbs.
—Kathleen Felton, Better Homes & Gardens, 9 May 2025
Each 4-foot-wide panel includes solid-core polystyrene insulation, surrounded by pre-galvanized steel with a steel truss system.
—Jennifer Castenson, Forbes.com, 21 May 2025
While it’s made of polystyrene, the chair is designed with a textured wood-grain finish that provides a rustic, natural flair to your outdoor space.
—Alicia Geigel, Southern Living, 30 Apr. 2025
See All Example Sentences for polystyrene
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Chicago Tribune, 18 May 2025
Product Details: Cover Material: Stain-resistant, water-resistant fabric | Fill: Recyclable polystyrene beans | Care: Spot-clean | Product Weight: 4.75 lbs.
—Kathleen Felton, Better Homes & Gardens, 9 May 2025
Each 4-foot-wide panel includes solid-core polystyrene insulation, surrounded by pre-galvanized steel with a steel truss system.
—Jennifer Castenson, Forbes.com, 21 May 2025
While it’s made of polystyrene, the chair is designed with a textured wood-grain finish that provides a rustic, natural flair to your outdoor space.
—Alicia Geigel, Southern Living, 30 Apr. 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 16 Jun. 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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