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/ˈaɪdə/ · noun
Any of the species of Somateria spp. and Polysticta stelleri or of the seaduck subfamily Merginae, which line their nests with fine down (taken from their own bodies)..
Use eider when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Eider means Any of the species of Somateria spp. and Polysticta stelleri or of the seaduck subfamily Merginae, which line their nests with fine down (taken from their own bodies)..
Common synonyms include eiderduck, eider duck.
The opposite depends on the specific sense.
Use eider where its definition matches the intended context.
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