Washer (noun)

1. A device that is used to wash clothes or dishes.
2. A flat ring or plate, typically of metal, that is placed under a nut or bolt head to distribute pressure and prevent leakage.
3. A flat ring or plate, typically of rubber, that is placed between two surfaces to prevent leakage or to cushion and protect the surfaces.

Origin:

From the old english word "wæscere" meaning "washer".

Examples:

1. The washing machine is a household appliance that is used to wash clothes.
2. The dishwasher is a household appliance that is used to wash dishes.
3. The plumber put a washer under the faucet to prevent leakage.
4. The mechanic put a washer between the nut and the bolt to distribute pressure.
5. The washer between the door and the frame prevent the door from rubbing against the frame.