Source : Webster's Revised Unabridged Dictionary (1913)

Nonmetallic \Non`me*tal"lic\, a.
   1. Not metallic.

   2. (Chem.) Resembling, or possessing the properties of, a
      nonmetal or metalloid; as, sulphur is a nonmetallic
      element.

Source : WordNet®

nonmetallic
     adj : not containing or resembling or characteristic of a metal;
           "nonmetallic elements" [syn: {nonmetal}] [ant: {metallic}]