Source : Webster's Revised Unabridged Dictionary (1913)

Ruddock \Rud"dock\, n. [AS. ruddic; cf. W. rhuddog the
   redbreast. [root]113. See {Rud}, n.] [Written also
   {raddock}.]
   1. (Zo["o]l.) The European robin. ``The tame ruddock and the
      coward kite.'' --Chaucer.

   2. A piece of gold money; -- probably because the gold of
      coins was often reddened by copper alloy. Called also {red
      ruddock}, and {golden ruddock}. [Obs.]

            Great pieces of gold . . . red ruddocks. --Florio.