The Collaborative International Dictionary of English v.0.48:

Laundress \Laun"dress\, n.
   A woman whose employment is laundering.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Laundress \Laun"dress\, v. i.
   To act as a laundress. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

laundress
    n 1: a working woman who takes in washing [syn: washwoman,
         washerwoman, laundrywoman, laundress]