The Collaborative International Dictionary of English v.0.48:

Dickey \Dick"ey\, Dicky \Dick"y\, n.
   1.

   1. A false detachable shirt front or bosom. [Also spelled
      dickie.]
      [1913 Webster]

   2. A gentleman's shirt collar. [Local, U. S.]
      [1913 Webster]

   3. A hat; esp., in U. S., a stiff hat or derby; in Eng., a
      straw hat. [Slang]
      [Webster 1913 Suppl.]

   4.
      (a) A seat for the driver (In a carriage); -- called also
          dickey box or dickie seat.
      (b) A seat at the back for servants.
          [Webster 1913 Suppl.]

   5. One of various animals; specif.:
      (a) A donkey.
      (b) Any small bird; -- called also dickeybird or dickey
          bird. [Colloq.]
      (c) The hedge sparrow. [Dial. Eng.]
      (d) The haddock.
          [Webster 1913 Suppl.] dickeybird

The Collaborative International Dictionary of English v.0.48:

dicky \dicky\ adj.
   Faulty. [British informal]

   Syn: dickey.
        [WordNet 1.5]

              I've got this dicky heart           --John le
                                                  Carre

The Collaborative International Dictionary of English v.0.48:

dicky \dicky\ n.
   See dickey.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

dicky
    adj 1: (British informal) faulty; "I've got this dicky heart"-
           John le Carre [syn: dicky, dickey]
    n 1: a small third seat in the back of an old-fashioned two-
         seater [syn: dickey, dickie, dicky, dickey-seat,
         dickie-seat, dicky-seat]
    2: a man's detachable insert (usually starched) to simulate the
       front of a shirt [syn: dickey, dickie, dicky,
       shirtfront]