noun, plural mer·gan·sers, (especially collectively) mer·gan·ser.
Origin of merganser
Examples from the Web for merganser
We have taken many nests of this Merganser, and invariably found them made on islands in the lochs.
For all the splendor of his plumage, the merganser was not conspicuous where he sat.Hoof and Claw|Charles G. D. Roberts
The females and young birds of the Goosander and Merganser are popularly called Dun-divers.British Birds in their Haunts|Rev. C. A. Johns
Knowing a mallard from a merganser has another side: gourmets prefer a corn-fed mallard to the fish duck.Ducks at a Distance|Robert W. Hines
This Merganser is a most expert diver, and every few moments either one or the other of the pair disappears in quest of food.