Source : Webster's Revised Unabridged Dictionary (1913)

Bufflehead \Buf"fle*head`\, n. [Buffle + head.]
   1. One who has a large head; a heavy, stupid fellow. [Obs.]

            What makes you stare so, bufflehead?  --Plautus
                                                  (trans. 1694).

   2. (Zo["o]l.) The buffel duck. See {Buffel duck}.

Source : WordNet®

bufflehead
     n : small North American diving duck; males have bushy head
         plumage [syn: {butterball}, {dipper}, {Bucephela albeola}]