Search Result for "polystyrene": 
Wordnet 3.0

NOUN (1)

1. a polymer of styrene; a rigid transparent thermoplastic;
- Example: "expanded polystyrene looks like a rigid white foam and is used as packing or insulation"



WordNet (r) 3.0 (2006):

polystyrene
    n 1: a polymer of styrene; a rigid transparent thermoplastic;
         "expanded polystyrene looks like a rigid white foam and is
         used as packing or insulation"