A species to fresh-water fish of the Cyprinidae or Carp
   family. The common European species is Leuciscus cephalus; the cheven.
   In America the name is applied to various fishes of the same family, of
   the genera Semotilus, Squalius, Ceratichthys, etc., and locally to
   several very different fishes, as the tautog, black bass, etc.