noun.
A very large molecule, such as a polymer or protein, consisting of many smaller structural units linked together.
The Century Dictionary and Cyclopedia
noun.
A molecule consisting of several molecules.
the GNU version of the Collaborative International Dictionary of English
noun.
A very large molecule, especially a polymer having from hundreds to many thousands of atoms, such as DNA, RNA, protein, polysaccharide, polyethylene, polycarbonate, etc.