noun

• (chemistry) Any binary compound of carbon and a more electropositive element
• (chemistry) The polyatomic ion C₂²⁻, or any of its salts.
• (chemistry) The monatomic ion C⁴⁻, or any of its salts.
• (chemistry) A carbon-containing alloy or doping of a metal or semiconductor, such as steel.
• (chemistry) Tungsten carbide.
• (cycling) trivial name for calcium carbide (CaC₂), used to produce acetylene in bicycle lamps in the early 1900s.