Source : Webster's Revised Unabridged Dictionary (1913)

Charbon \Char"bon\, n. [F., coal, charbon.]
   1. (Far.) A small black spot or mark remaining in the cavity
      of the corner tooth of a horse after the large spot or
      mark has become obliterated.

   2. A very contagious and fatal disease of sheep, horses, and
      cattle. See {Maligmant pustule}.