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

1865–70; non- + metal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonmetal (nɒnˈmɛtəl)
any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Elements can generally be described as either metals or nonmetals.
It can be used to detect both metals and nonmetals in air.
Graphite has properties of both metals and nonmetals, which makes it suitable for many industrial applications.
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