Grinder /(?)/

Grind·er

Grinder

n.
  1. One who, or that which, grinds.
  2. One of the double teeth, used to grind or masticate the food; a molar.
  3. 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. (Zool.)
  4. A submarine sandwich. [local, U.S.]

Phrases & Compounds
Grinder's asthma
a lung disease produced by the mechanical irritation of the particles of steel and stone given off in the operation of grinding.