non-metal

noun Chemistry.

1. an element not having the character of a metal, as carbon or nitrogen.
2. an element incapable of forming simple positive ions in solution.

noun

1. any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity

also nonmetal, 1866, from non- + metal. Related: Non-metallic (1815).