macromolecule

from WordNet (r) 3.0 (2006)

macromolecule
    n 1: any very large complex molecule; found only in plants and
         animals [syn: {macromolecule}, {supermolecule}]

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]