Formerly, the metallic base of a fixed alkali, or alkaline earth; -- applied by Sir H. Davy to sodium, potassium, and some other metallic substances whose metallic character was supposed to be not well defined.
- A nonmetallic element, such as arsenic, that has some of the chemical properties of a metal.
- A nonmetallic element, such as carbon, that can form an alloy with metals.
- Relating to or having the properties of a metalloid.
- Having the appearance of a metal.