charcoal

n. 1 a form of carbon consisting of black residue from partially burnt wood etc. B piece of this for drawing. C a drawing in charcoal. 2 (in full charcoal grey) dark grey. [origin unknown]

v. t. Impure carbon prepared from vegetable or animal substances; esp., coal made by charring wood in a kiln, retort, etc., from which air is excluded. It is used for fuel and in various mechanical, artistic, and chemical processes.