noun
1. : a showy American duck ( Aix sponsa ) which nests in hollow trees and the male of which has a large crest and plumage varied with green, purple, black, white, and chestnut — called also summer duck, wood widgeon
2. : hooded merganser
3. : an Australian goose ( Chenonetta jubata ) having elongated deep brown feathers on the rear part of the neck
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