nounpl. -·fish· or -·fish·es (see fish)
- any of a genus (Globicephala) of large, black, migratory dolphins; pilot whale
- any of a number of dark marine fishes, as a sea bass or tautog
- an edible Siberian or Alaskan freshwater fish (Dallia pectoralis) of the same order (Salmoniformes) as trout, pike, and salmon: reputed to revive after being frozen
nounpl. blackfish, or black·fish·es
- Any of various dark-colored fishes, such as:a. A small edible freshwater fish (Dallia pectoralis) that inhabits streams and ponds of Alaska and Siberia and is noted for its ability to withstand freezing.b. See tautog.
- Any of several dark-colored toothed whales, especially the pilot whale.
(plural blackfishes or blackfish)
- (chiefly Scotland) The Atlantic salmon, Salmo salar, especially a female after spawning. [from 16th c.]
- Any of various dark-coloured fish of the Old World, especially the rudderfish (Centrolophus niger). [from 17th c.]
- A pilot whale, genus Globicephalus (occasionally also used for various other whales). [from 17th c.]
- (North America) Either of two dark-coloured fish of the west Atlantic, the tautog of New England (Tautoga onitis) and the black sea bass (Centropristis striata). [from 18th c.]
- (Australia, New Zealand) Any of various dark-coloured fishes of Australasia, especially the luderick, Girella tricuspidata, and a freshwater fish, Gadopsis marmoratus. [from 18th c.]