a small North American diving duck related tohe goldeneye, with alarge puffy head. The male has white plumage with a black back (产于北美的)白枕鹊鸭
Bucephala albeola, family Anatidae 拉丁名Bucephala albeola,鸭科
语源
mid 17th cent. (in the sense 'simpleton'): from obsolete buffle 'buffalo' + head. The current sense (mid 18th cent.) may be an independent formation because of the duck's large square-shaped head