One who, or that which, washes.
- One who washes: a washer of clothes; a washer of windows.
- An appliance used for washing, especially:
- A washing machine.
- An automatic dishwasher.
- A flat disk, as of metal, plastic, rubber, or leather, placed beneath a nut or at an axle bearing or a joint to relieve friction, prevent leakage, or distribute pressure.