From Longman Dictionary of Contemporary EnglishStyrofoamSty‧ro‧foam /ˈstaɪərəfəʊm $ ˈstaɪrəfoʊm/ noun [uncountable] trademarkTI a soft light plastic material that prevents heat or cold from passing through it, used especially to make containers a Styrofoam cup
Examples from the Corpus
Styrofoam• A giant Styrofoam heart to send to your true love, from Better Than a Letter, $ 4. 50.• The little Styrofoam houses he used to show off his idea were as far as the scheme advanced during his tenure.• Inside, covered by a light packing of Styrofoam bubbles, were thin plastic envelopes showing the glint of metal.• The Styrofoam plant is now wholly owned by Dow. 