washerwoman

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A woman who washes clothes and linens for a living.

from The Century Dictionary.

• noun A woman who washes clothes for others or for hire.
• noun The dishwasher or washdish. a wagtail. See cut under wagtail.

from the GNU version of the Collaborative International Dictionary of English.

• noun A woman who washes clothes, especially for hire, or for others.
• noun (Zoöl.), Prov. Eng. The pied wagtail; -- so called in allusion to its beating the water with its tail while tripping along the leaves of water plants.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A woman who washes other people's laundry for payment.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a working woman who takes in washing