bull-heads

bullhead

[bool-hed]
noun
1.
any of several North American, freshwater catfishes of the genus Ictalurus, having a rounded or truncate caudal fin.
2.
any of several other fishes, as the freshwater sculpins of the genus Cottus, especially those species having a hornlike spine on each side of the head.
3.
an obstinate or stupid person.

Origin:
1665–75, Americanism; bull1 + head

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World English Dictionary
bullhead (ˈbʊlˌhɛd)
 
n
1.  any of various small northern mainly marine scorpaenoid fishes of the family Cottidae that have a large head covered with bony plates and spines
2.  any freshwater North American catfish of the genus Ameiurus (or Ictalurus), having a large head bearing several long barbels
3.  a scorpion fish, Scorpaena guttata, of North American Pacific coastal waters
4.  informal a stupidly stubborn or unintelligent person

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