polystyrene

noun

UK /ˌpɒl.iˈstaɪ.riːn/

US /ˌpɑː.liˈstaɪ.riːn/

A light plastic used to make things like cups and packing peanuts.

The takeaway food came in a polystyrene box.

SYNONYMS

styrofoam foam plastic expanded polystyrene plastic foam

RELATED WORDS

plastic polymer packaging insulation styrene

OTHER MEANINGS

2. A hard, clear plastic used for CD cases and disposable cutlery.

The clear polystyrene lid cracked when it fell.

3. A material used in building insulation to keep heat in.

They fitted polystyrene boards behind the walls.

4. A lightweight foam used in craft projects and model making.

She cut shapes from a polystyrene block for the school project.