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polysaccharide
polysemy
polysepalous
polysome
polysomic
polysorbate
polyspermy
polystichous
polystyrene
polysulfide
polysyllabic
polysyllable
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polysyndeton
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polysystemicism
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polystyrene
pol·y·sty·rene [ pòllee st rn ]


noun 
Definition:
 
synthetic packing or insulating material: a synthetic polymer of styrene that is stable in various physical forms. As a white rigid foam expanded polystyrene it is used for packing and insulation.
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