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The Collaborative International Dictionary of English v.0.48 (gcide)

Charcoal \Char"coal`\, n. [See {Char}, v. t., to burn or to
reduce to coal, and {Coal}.]
1. 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.
[1913 Webster]

2. (Fine Arts) Finely prepared charcoal in small sticks, used
as a drawing implement.
[1913 Webster]

{Animal charcoal}, a fine charcoal prepared by calcining
bones in a closed vessel; -- used as a filtering agent in
sugar refining, and as an absorbent and disinfectant.

{Charcoal blacks}, the black pigment, consisting of burnt
ivory, bone, cock, peach stones, and other substances.

{Charcoal drawing} (Fine Arts), a drawing made with charcoal.
See {Charcoal}, 2. Until within a few years this material
has been used almost exclusively for preliminary outline,
etc., but at present many finished drawings are made with
it.

{Charcoal point}, a carbon pencil prepared for use in an
electric light apparatus.

{Mineral charcoal}, a term applied to silky fibrous layers of
charcoal, interlaminated in beds of ordinary bituminous
coal; -- known to miners as mother of coal.
[1913 Webster] charcoal-gray