noun Mer·gus \ˈmərgəs\

Definition of Mergus

  1. :  a genus of highly aquatic diving ducks including several typical mergansers having males that are brightly marked and develop an eclipse plumage

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Origin and Etymology of mergus

New Latin, from Latin, diver (waterfowl), from mergere to dip, plunge — more at merge

Seen and Heard

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a rounded knoll or a ridge of ice

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