Grinder

Part of speech: noun (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. Grinder's asthma, phthisis, or rot (Med.), a lung disease produced by the mechanical irritation of the particles of steel and stone given off in the operation of grinding.