scaup

1. Large scaup of North America having a greenish iridescence on the head of the male.
   北美洲的大型斑背潜鸭，雄性的羽冠为偏绿的五彩色。

noun

1. diving ducks of North America having a bluish-grey bill

   Synonym:    scaup duckbluebillbroadbill