a small duck, Oxyura jamaicensis, that inhabits marshes, ponds, etc, in North America and N South America and has a stiff upright tail. The male has a reddish-brown body and blue bill in the breeding season
ruddy duck in American English
US
a small, North American duck (Oxyura jamaicensis), the breeding male of which has a brownish-red neck and upper body, black crown, white cheeks, and blue bill