polyatomic Meaning, Definition & Usage

  1. adjective of or relating to a molecule made up of more than two atoms

WordNet

Pol`y*a*tom"ic adjective
Etymology
Poly- + atomic.
Definitions
  1. (Chem.) (a) Having more than one atom in the molecule; consisting of several atoms. (b) Having a valence greater than one. Obs.

Webster 1913