duck with white specula
Rare ornithological term for any duck species that has white patches (specula) on the wings. Not a specific species name; refers to the visible wing marking. The cross-reference 羽白 (はじろ) indicates the white wing pattern.
See also: 羽白
I found the notation '羽白鴨' in a field guide, but it is not a common name.
Hajirogamo is not a specific species; it is sometimes used as a general term for ducks with white patches on their wings.
Compound of 羽白 (はじろ, 'white-winged') and 鴨 (かも, 'duck'). The exact origin is uncertain; likely a descriptive term used in older or specialized bird literature.