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Grinder

1. One who, or that which, grinds.

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

3. (Science: zoology) 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.

(Science: medicine) grinders asthma, phthisis, or rot, a lung disease produced by the mechanical irritation of the particles of steel and stone given off in the operation of grinding.