WordReference Random House Unabridged Dictionary of American English © 2019
black•fish  (blakfish′),USA pronunciation n., pl. (esp. collectively) -fish,  (esp. referring to two or more kinds or species) -fish•es. 
  1. Fishany of various dark-colored fishes, as the tautog, Tautoga onitis, or the sea bass, Centropristes striatus.
  2. Fisha small, freshwater food fish, Dallia pectoralis, found in Alaska and Siberia, noted for its ability to survive frozen in ice.
  3. MammalsSee  black whale. 
  • black + fish 1680–90, American.


Collins Concise English Dictionary © HarperCollins Publishers::

blackfish /ˈblækˌfɪʃ/ n ( pl -fish, -fishes)
  1. a minnow-like Alaskan freshwater fish, Dallia pectoralis, related to the pikes and thought to be able to survive prolonged freezing
  2. a female salmon that has recently spawned
    Compare redfish



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