[ 'kru:ʃ(ə)n ]
■ noun a small carp of still or slow-moving waters, farmed in eastern Europe. [ Carassius carassius .]
Origin
C18: from Low Ger. karusse , karutze , perh. based on L. coracinus , from Gk korax 'raven', also denoting a black fish found in the Nile.