The Collaborative International Dictionary of English v.0.48:

Raker \Rak"er\ (r[=a]k"[~e]r), n. [See 1st Rake.]
   1. One who, or that which, rakes; as:
      (a) A person who uses a rake.
      (b) A machine for raking grain or hay by horse or other
          power.
      (c) A gun so placed as to rake an enemy's ship.
          [1913 Webster]

   2. (Zool.) See Gill rakers, under 1st Gill.
      [1913 Webster]