Webster’s Revised Unabridged Dictionary · 1913
Crucian carp
Cru′cian carp′ (-shan k?rp′). [Cf. Sw. karussa, G. karausche, F. carousse, -assin, corassin, LL. coracinus, Gr. κορακῖνος a sort of fish.] (Zoöl.) A kind of European carp (Carasius vulgaris), inferior to the common carp; — called also German carp.
☞ The gibel or Prussian carp is now generally considered a variety of the crucian carp, or perhaps a hybrid between it and the common carp.