Styrofoam (noun)

A light, white, brittle material that is used for thermal insulation and as a packing material.

Origin:

The word styrofoam is a trademark of the dow chemical company for closed-cell extruded polystyrene foam made for thermal insulation and craft applications.

Examples:

1. Styrofoam is a popular insulation material for walls and roofs in construction.
2. She carefully packed the fragile vase in styrofoam before mailing it.
3. The styrofoam cup is not environmentally friendly and not biodegradable.
4. He used styrofoam to make a model of a house for a school project.
5. The styrofoam coolers are great for keeping things cold for a long time on a hot day.