'blue roach' definitions:

Definition of 'blue roach'

From: GCIDE
  • Rudd \Rudd\, n. [See Rud, n.] (Zool.) 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. [1913 Webster]