Rudd \Rudd\, n. [See {Rud}, n.] (Zo["o]l.) A fresh-water European fish of the Carp family ({Leuciscus erythrophthalmus}). It is about the size and shape of the roach, but it has the dorsal fin farther back, a stouter body, and red irises. Called also {redeye}, {roud}, {finscale}, and {shallow}. A blue variety is called {azurine}, or {blue roach}.