The Collaborative International Dictionary of English v.0.48:
Nonmetallic \Non`me*tal"lic\, a. 1. Not metallic. [1913 Webster] 2. (Chem.) Resembling, or possessing the properties of, a nonmetal or metalloid; as, sulphur is a nonmetallic element. [1913 Webster]WordNet (r) 3.0 (2006):
nonmetallic adj 1: not containing or resembling or characteristic of a metal; "nonmetallic elements" [syn: nonmetallic, nonmetal] [ant: metal(a), metallic]