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.
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Lophodytes cucullatus
n : small North American duck with a high circular crest on the
male's head [syn: hooded merganser, hooded sheldrake]