fi·ber·glass (US) or Brit fi·bre·glass 
/ˈfaɪbɚˌglæs, Brit ˈfaɪbəˌglɑ:s/ noun
/ˈfaɪbɚˌglæs, Brit ˈfaɪbəˌglɑ:s/ noun [noncount] : a light and strong material that is made from thin threads of glass and that is used in making various products — often used before another noun ▪ a fiberglass boat
