• noun a mineral form of carbon occurring naturally as crystals or as a soft black deposit
  • The most common crystalline form of carbon, found in pencils and interstellar gas clouds
  • An allotropic form of the chemical element carbon. It is a soft black solid which conducts heat and electricity well. Its applications include its use as electrodes, in brushes, in electroplating, as a coating for CRTs, as a moderator in nuclear reactors, and as a lubricant.

Not what you were looking for?