Dictionary![]() ![]() pol•y•sty•renePronunciation: (pol"ē-stī'rēn, -stēr'ēn), [key] —n. Chem. a clear plastic or stiff foam, a polymer of styrene, used chiefly as an insulator in refrigerators and air conditioners. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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