The Collaborative International Dictionary of English v.0.48:

Raddock \Rad"dock\ (r[a^]d"d[u^]k), n. (Zool.)
   The ruddock. [Prov. Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ruddock \Rud"dock\, n. [AS. ruddic; cf. W. rhuddog the
   redbreast. [root]113. See Rud, n.] [Written also
   raddock.]
   1. (Zool.) The European robin. "The tame ruddock and the
      coward kite." --Chaucer.
      [1913 Webster]

   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.]
      [1913 Webster]

            Great pieces of gold . . . red ruddocks. --Florio.
      [1913 Webster]