merganser

Any of various fish-eating diving ducks primarily of the genus Mergus, having a slim hooked bill.

A bird of the genus Mergus or subfamily Merginǣ; family Anatidæ; a sawbill, garbill, or fishing-duck.

[capitalized] A genus of Merginæ same as Mergus.

Any bird of the genus Mergus (Merganser), and allied genera of the subfamily Merginae. They are allied to the ducks, but have a sharply serrated bill, eat fish, and dive for food. Also called fish duck.

the smew or white nun.

Any of various diving ducks of the genera Mergus or Lophodytes, which feed on fish and have a sharply serrated bill.

large crested fish-eating diving duck having a slender hooked bill with serrated edges