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]