Definify.com

Webster 1913 Edition

Noun.

(Zool.)

(a)

A cyprinoid fish of the Mississippi valley (

Pimephales promelas

); – called also

black-headed minnow

(b)

A labroid food fish of California; the redfish.

fathead ‎(plural fatheads)

(derogatory) An idiot; a fool.
Donny, you fathead! You forgot to put the milk in the fridge and now it's spoiled!
(zoology) A cyprinoid fish of the Mississippi valley, Pimephales promelas, the black-headed minnow.
(zoology) A labroid food fish of California; the redfish.