bullhead
Concise Oxford English Dictionary © 2008 Oxford University Press:
bullhead/ˈbʊlhɛd/
▶noun
- 1 a small, mainly freshwater fish with a broad flattened head and spiny fins. [Cottus gobio (miller's thumb) and other species.]
- 2 an American freshwater catfish. [Ictalurus nebulosus and related species.]
'bullhead' also found in these Oxford entries:

