1) Matter 2) Substance 
• (a.) Having a valence greater than one. • (a.) Having more than one atom in the molecule; consisting of several atoms.
(pol″e-ә-tom´ik) made up of several atoms.
Pol`y·a·tom'ic adjective [ Poly- + atomic .] (Chemistry) (a) Having more than one atom in the molecule; consisting of several atoms. (b) Having a valence greater than one. [ Obsolete]
[adj] - of or relating to a molecule made up of more than two atoms
adjective of or relating to a molecule made up of more than two atoms