The Collaborative International Dictionary of English v.0.48:

Coachman \Coach"man\, n.; pl. Coachmen.
   1. A man whose business is to drive a coach or carriage.
      [1913 Webster]

   2. (Zool.) A tropical fish of the Atlantic ocean (Dutes
      auriga); -- called also charioteer. The name refers to
      a long, lashlike spine of the dorsal fin.
      [1913 Webster]