Mer·gan·ser n. Zool. Any bird of the genus Mergus (Merganser), and allied genera of the subfamily
Note: ☞ The red-breasted merganser (Merganser serrator) inhabits both hemispheres. It is called also sawbill, harle, and sheldrake. The American merganser (Merganser Americanus.) and the hooded merganser (Lophodytes cucullatus) are well-known species.
White merganser, the smew or white nun.
n : large crested fish-eating diving duck having a slender
hooked bill with serrated edges [syn: fish duck, sawbill,