washhouse

2. A room or building in a large house or institution set aside for washing clothes and linens.

The old mansion still has its original washhouse in the cellar.

3. A public building where people could pay to wash and dry their laundry.

In the 1920s, many city families used the neighborhood washhouse.

4. A place where wool or other materials are washed as part of an industrial process.

The mill's washhouse cleaned the raw wool before spinning.