Styrofoam is a type of polystyrene (a type of plastic) foam that's light yet strong. It’s often used to make take-out coffee cups and packing materials.

Styrofoam — which is usually capitalized, because it's a proprietary name — is a type of lightweight, durable foam. If you've ever gotten a package full of little packing peanuts, they were probably made of Styrofoam. Styrofoam is controversial, so a lot of places stopped using it. Since it doesn't biodegrade, Styrofoam products are considered harmful to the environment.

Definitions of Styrofoam
  1. noun
    a light resilient foam of polystyrene
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    type of:
    a polymer of styrene; a rigid transparent thermoplastic
    a lightweight material in cellular form; made by introducing gas bubbles during manufacture
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