polyethylene

from WordNet (r) 3.0 (2006)

polyethylene
    n 1: a lightweight thermoplastic; used especially in packaging
         and insulation [syn: {polyethylene}, {polythene}]

from The Collaborative International Dictionary of English v.0.48

macromolecule \mac`ro*mol"e*cule\, n. (Chem., Biochem.)
   A very large molecule, especially a polymer having from
   hundreds to many thousands of atoms, such as {DNA}, {RNA},
   {protein}, {polysaccharide}, {polyethylene}, {polycarbonate},
   etc.
   [PJC]