1. (Science: zoology) a fresh water fish of many species, of the genus Uranidea, especially. U. Gobio of Europe, and u. Richardsoni of the united States; called also millers thumb. In America, several species of Amiurus; called also catfish, horned pout, and bullpout. a marine fish of the genus Cottus; the sculpin. 2. (Science: zoology) The black-bellied plover (Squatarola helvetica); called also beetlehead. The golden plover.3. A stupid fellow; a lubber. 4. (Science: zoology) a small black water insect. (Science: zoology) bullhead whiting, the kingfish of Florida (Menticirrus alburnus).