Noun horse mackerel has 3 senses
  1. bluefin, bluefin tuna, horse mackerel, Thunnus thynnus - largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
    --1 is a kind of tuna, tunny
    --1 is a member of Thunnus, genus Thunnus
    --1 has parts: bluefin, bluefin tuna
  2. horse mackerel, saurel, Trachurus trachurus - large elongated compressed food fish of the Atlantic waters of Europe
    --2 is a kind of scad
  3. horse mackerel, jack mackerel, Spanish mackerel, saurel, Trachurus symmetricus - a California food fish
    --3 is a kind of scad
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