The Collaborative International Dictionary of English v.0.48:

Ruffed \Ruffed\, a.
   Furnished with a ruff.
   [1913 Webster]

   Ruffed grouse (Zool.), a North American grouse (Bonasa
      umbellus) common in the wooded districts of the Northern
      United States. The male has a ruff of brown or black
      feathers on each side of the neck, and is noted for the
      loud drumming sound he makes during the breeding season.
      Called also tippet grouse, partridge, birch
      partridge, pheasant, drummer, and white-flesher.

   ruffed lemur (Zool.), a species of lemur (lemur varius)
      having a conspicuous ruff on the sides of the head. Its
      color is varied with black and white. Called also ruffed
      maucaco.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Drummer \Drum"mer\, n.
   1. One whose office is to best the drum, as in military
      exercises and marching.
      [1913 Webster]

   2. One who solicits custom; a commercial traveler. [Colloq.
      U.S.] --Bartlett.
      [1913 Webster]

   3. (Zool.) A fish that makes a sound when caught; as:
      (a) The squeteague.
      (b) A California sculpin.
          [1913 Webster]

   4. (Zool.) A large West Indian cockroach (Blatta gigantea)
      which drums on woodwork, as a sexual call.
      [1913 Webster]

WordNet (r) 3.0 (2006):

drummer
    n 1: someone who plays a drum