rhizoverbBeta
DictionarypolystyrenePlastic used for packaging and insulation
noun

polystyrene

pah-lee-STY-reen/ˌpɑːliˈstaɪriːn/

A synthetic plastic commonly used in foam packaging and insulation.

Molded polystyrene protects the appliance inside the shipping carton.

An open shipping carton with white molded expanded-polystyrene end caps protecting a small unbranded appliance.
Etymology
polyGreekmany
+styreneEnglisha colorless hydrocarbon

“Many” refers to the large number of styrene units making up this polymer. The plastic used in foam packaging is thus named for its molecular building blocks.

In context

Atlas Molded Products0:02
Today I'd like to show you the science of how we make expanded polystyrene foam. Let's check it out. It's so simple, it only takes two ingredients, resin and steam.
EPS Foam: How It’s Made | Expanded Polystyrene Manufacturing Process

More examples

  • The builder installs polystyrene panels to insulate the basement walls.
  • This lightweight cooler is made of polystyrene foam.
  • Our local recycling program does not accept polystyrene packaging.

Similar words

plastic
A broader material category that includes polystyrene and other polymers.
foam
Describes a cellular material, not necessarily one made from polystyrene.