Noun merganser has 1 sense
  1. merganser, fish duck, sawbill, sheldrake - large crested fish-eating diving duck having a slender hooked bill with serrated edges
    --1 is a kind of sea duck
    --1 is a member of Mergus, genus Mergus
    --1 has particulars:
     goosander, Mergus merganser; American merganser, Mergus merganser americanus; red-breasted merganser, Mergus serrator; smew, Mergus albellus; hooded merganser, hooded sheldrake, Lophodytes cucullatus
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