Толковый словарь английского языка Oxford English Reference - washer

n. 1 a a person or thing that washes. b a washing-machine. 2 a flat ring of rubber, metal, leather, etc., inserted at a joint to tighten it and prevent leakage. 3 a similar ring placed under the head of a screw, bolt, etc., or under a nut, to disperse its pressure. 4 Austral. a cloth for washing the face. Phrases and idioms washer-up (pl. washers-up) a person who washes up dishes etc.