The Collaborative International Dictionary of English v.0.48:

Washing \Wash"ing\, n.
   1. The act of one who washes; the act of cleansing with
      water; ablution.
      [1913 Webster]

   2. The clothes washed, esp. at one time; a wash.
      [1913 Webster]

   3. (Mining) Gold dust procured by washing; also, a place
      where this is done; a washery.
      [Webster 1913 Suppl.]

   4. A thin covering or coat; as, a washing of silver.
      [Webster 1913 Suppl.]

   5. (Stock Exchanges) The operation of simultaneously buying
      and selling the same stock for the purpose of manipulating
      the market. The transaction is fictitious, and is
      prohibited by stock-exchange rules.
      [Webster 1913 Suppl.]

   6. (Pottery) The covering of a piece with an infusible
      powder, which prevents it from sticking to its supports,
      while receiving the glaze.
      [Webster 1913 Suppl.]

   Washing bear (Zool.), the raccoon.

   Washing bottle (Chem.), a bottle fitted with glass tubes
      passing through the cork, so that on blowing into one of
      the tubes a stream of water issuing from the other may be
      directed upon anything to be washed or rinsed, as a
      precipitate upon a filter, etc.

   Washing fluid, a liquid used as a cleanser, and consisting
      usually of alkaline salts resembling soaps in their
      action.

   Washing machine, a machine for washing; specifically, a
      machine for washing clothes.

   Washing soda. (Chem.) See Sodium carbonate, under
      Sodium.

   Washing stuff, any earthy deposit containing gold enough to
      pay for washing it; -- so called among gold miners.
      [1913 Webster]