The Collaborative International Dictionary of English v.0.48:
Tench \Tench\, n. [OF. tenche, F. tanche, L. tinca.] (Zool.) A European fresh-water fish (Tinca tinca, or Tinca vulgaris) allied to the carp. It is noted for its tenacity of life. [1913 Webster]WordNet (r) 3.0 (2006):
Tinca tinca n 1: freshwater dace-like game fish of Europe and western Asia noted for ability to survive outside water [syn: tench, Tinca tinca]