eider duck

noun
any of several large sea ducks of the genus Soamateria and allied genera of the Northern Hemisphere, the females of which yield eiderdown.

Origin:
1850–55

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World English Dictionary
eider or eider duck (ˈaɪdə)
 
n
any of several sea ducks of the genus Somateria, esp S. mollissima, and related genera, which occur in the N hemisphere. The male has black and white plumage, and the female is the source of eiderdown
 
[C18: from Old Norse æthr; related to Swedish ejder, Dutch, German Eider]
 
eider duck or eider duck
 
n
 
[C18: from Old Norse æthr; related to Swedish ejder, Dutch, German Eider]

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Example sentences
Case report: epizootic of fowl cholera in the common eider duck.
The chicks are getting to an age where they may play with an eider duck wing or fish tail.
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