Source : Webster's Revised Unabridged Dictionary (1913)

Wringer \Wring"er\, n.
   1. One who, or that which, wrings; hence, an extortioner.

   2. A machine for pressing water out of anything, particularly
      from clothes after they have been washed.

Source : WordNet®

wringer
     n : a clothes dryer consisting of two roles between which the
         wet clothes are squeezed