Thou Shall Not..

[Bowyn Aerrow]

Thou shalt not 'blah blah blah' endlessly over a dead subject, furthermore:

http://www.thefreedictionary.com/washer

wash·er (wshr, wôshr)n.
1. One who washes: a washer of clothes; a washer of windows.
2. An appliance used for washing, especially:
a. A washing machine.
b. An automatic dishwasher.

3. 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.

(my emphasis).

Thou shall not depend on the wiki for definitions of words, there are dictionaries for that.