The Collaborative International Dictionary of English v.0.48:

Grinder \Grind"er\, n.
   1. One who, or that which, grinds.
      [1913 Webster]

   2. One of the double teeth, used to grind or masticate the
      food; a molar.
      [1913 Webster]

   3. (Zool.) The restless flycatcher (Seisura inquieta) of
      Australia; -- called also restless thrush and volatile
      thrush. It makes a noise like a scissors grinder, to
      which the name alludes.

   4. A submarine sandwich. [local, U.S.]

   Syn: submarine, hoagie.
        [PJC]

   Grinder's asthma, Grinder's phthisis, or Grinder's rot
      (Med.), a lung disease produced by the mechanical
      irritation of the particles of steel and stone given off
      in the operation of grinding.
      [1913 Webster]