bufflehead

 
Pronunciation: /ˈbʌf(ə)lhɛd/

noun

  • a small North American diving duck related to the goldeneye, with a large puffy head. The male has white plumage with a black back.
    • Bucephala albeola, family Anatidae

Origin:

mid 17th century (in the sense 'simpleton'): from obsolete buffle 'buffalo' + head. The current sense (mid 18th century) may be an independent formation because of the duck's large square-shaped head