noun
: any of various ducks that are predominantly black or dusky in color: as
a. : a common duck ( Anas rubripes ) of the northeastern United States and Canada related to the mallard but having in both sexes plumage that is chiefly dusky brown with lighter edging to the feathers
b. : scoter ; especially : black scoter
c. : ring-necked duck
d. : a brownish duck ( Anas superciliosa ) of Australia, New Zealand, and Polynesia highly regarded as a game and table bird