Any of several large sea ducks , especially of the genus Somateria of northern regions , having soft , commercially valuable down and predominantly black and white plumage in the male .
绒鸭一种大海鸭,尤指北部地区的欧绒鸭属,有柔软的有商业价值的鸭绒,雄鸭毛主要为黑白色。