wash ‧ er /ˈwɒʃə $ ˈwɒːʃər, ˈwɑː-/ BrE AmE noun [countable]
[ Word Family: noun : ↑ wash , ↑ washer , ↑ washing ; adjective : ↑ washable , ↑ unwashed ; verb : ↑ wash ]
[ Sense 1: Date: 1300-1400 ; Origin: Origin unknown ]
[ Sense 2: Date: 1800-1900 ; Origin: wash ]
1 . a thin flat ring of plastic, metal, rubber etc that is put over a ↑ bolt before the ↑ nut is put on, or between two pipes, to make a tighter joint
2 . informal a ↑ washing machine