fulling mill

from The Collaborative International Dictionary of English v.0.48

Fulling \Full"ing\, n.
   The process of cleansing, shrinking, and thickening cloth by
   moisture, heat, and pressure.
   [1913 Webster]

   {Fulling mill}, a mill for fulling cloth as by means of
      pesties or stampers, which alternately fall into and rise
      from troughs where the cloth is placed with hot water and
      fuller's earth, or other cleansing materials.
      [1913 Webster]