canvasbacked is a form of:

Canvasback



noun
1.
សត្វទាម្យ៉ាង (នៅអាមេរិកខាងជើង)
ENGLISH MEANING
noun
1.
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.