carbide

noun

1. Any binary compound of carbon and a more electropositive element
2. The polyatomic ion C2−2, or any of its salts.
3. The monatomic ion C⁴⁻, or any of its salts.
4. A carbon-containing alloy or doping of a metal or semiconductor, such as steel.
5. Tungsten carbide.
6. trivial name for calcium carbide (CaC₂), used to produce acetylene in bicycle lamps in the early 1900s.