'Aythya vallisneria' definitions:

Definition of 'Aythya vallisneria'

From: GCIDE
  • Canvasback \Can"vas*back`\, n. (Zool.) 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. [1913 Webster]