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CANVASBACK
canvasback, canvasback duck, Aythya valisineria
(noun) North American wild duck valued for sport and food
Source: WordNet® 3.1
Etymology
Noun
canvasback (plural canvasbacks)
A North American wild duck, Aythya valisineria, popular as a game bird.
Source: Wiktionary
Can"vas*back`, n. (Zoöl.)
Definition: A Species of duck (Aythya vallisneria), esteemed for the delicacy of its flesh. It visits the United States in autumn; particularly Chesapeake Bay and adjoining waters; -- so named from the markings of the plumage on its back.
Source: Webster’s Unabridged Dictionary 1913 Edition
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