Etymology
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merganser (n.)

genus of duck-like water birds of the northern hemisphere, 1752, coined in Modern Latin (1550s), from Latin mergus "waterfowl, diver" (from mergere "to dip, immerse;" see merge (v.)) + anser "goose" (see goose (n.)).

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Definitions of merganser

merganser (n.)
large crested fish-eating diving duck having a slender hooked bill with serrated edges;
Synonyms: fish duck / sawbill / sheldrake
From wordnet.princeton.edu