Definition of long-tailed duck
: a common sea duck (Clangula hyemalis) of the more northern parts of the northern hemisphere of which the adult male is marked with sharply contrasted black and white and has the middle tail feathers very long and slender and the female is plainer and lacks the long tail feathers
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Time Traveler for long-tailed duck
The first known use of long-tailed duck was in 1750
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