A fresh-water fish of many species, of the genus Uranidea, esp. U. gobio of Europe, and U. Richardsoni of the United States; -- called also miller's thumb.
- Any of several large-headed North American freshwater catfishes of the genus Ictalurus.
- Any of several fishes of the family Cottidae, such as the sculpin and the miller's thumb.
- Upper Northern U.S. See catfish.