Found 2 items, similar to polyatomic.
English → English (WordNet) Definition: polyatomic polyatomic adj : of or relating to a molecule made up of more than two atoms
English → English (gcide) Definition: Polyatomic Polyatomic \Pol`y*a*tom"ic\, a. [Poly- + atomic.] (Chem.) (a) Having more than one atom in the molecule; consisting of several atoms. (b) Having a valence greater than one. [Obs.] [1913 Webster]