Source : Webster's Revised Unabridged Dictionary (1913)

Drummer \Drum"mer\, n.
   1. One whose office is to best the drum, as in military
      exercises and marching.

   2. One who solicits custom; a commercial traveler. [Colloq.
      U.S.] --Bartlett.

   3. (Zo["o]l.) A fish that makes a sound when caught; as:
      (a) The squeteague.
      (b) A California sculpin.

   4. (Zo["o]l.) A large West Indian cockroach ({Blatta
      gigantea}) which drums on woodwork, as a sexual call.