eider
Concise Oxford English Dictionary © 2008 Oxford University Press:
eider /ˈʌɪdə/
▶noun (pl. same or eiders) (also eider duck) a northern sea duck of which the male is mainly black-and-white and the female brown. [Somateria mollissima and related species.]
– origin C17: from Icelandic æthur, from ON æthr.
'eider' also found in these Oxford entries:
