Bullhead

n.
  1. (Zoöl.) A small black water insect.
    1. A fresh-water fish of many species, of the genus Uranidea, esp. Uranidea gobio of Europe, and Uranidea Richardsoni of the United States; -- called also miller's thumb.
    2. In America, several species of Amiurus; -- called also catfish, horned pout, and bullpout.
    3. A marine fish of the genus Cottus; the sculpin.
    4. The black-bellied plover (Squatarola helvetica); -- called also beetlehead.
    5. The golden plover.
    Bullhead whiting (Zoöl.),
    the kingfish of Florida (Menticirrus alburnus).