(n.) A ring of metal, leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc.
WASHER
Meaning of WASHER in English
Webster's English dictionary. Английский словарь Webster. 2012