carbide

noun

1. Any binary compound of carbon and a more electropositive element

2. The polyatomic ion C22−, 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.