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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. A trademark used for a light, resilient polystyrene plastic. This trademark often occurs in print in lowercase: "throw-away plates, utensils and styrofoam trays” ( Washington Post).

WordNet 3.0

  1. n. a light resilient foam of polystyrene

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‘Styrofoam’ has been looked up 743 times, added to 3 lists, and is not a valid Scrabble word.