also: うみあいさ
noun
red-breasted merganser
A species of diving duck (Mergus serrator) found in coastal waters. The name is a standard ornithological term.
ウミアイサは冬に日本の沿岸で見られることがある。
The red-breasted merganser can sometimes be seen along the coasts of Japan in winter.
The name ウミアイサ literally means 'sea merganser' (海 + 秋沙). The exact historical derivation is uncertain, but it distinguishes this marine species from the common merganser (カワアイサ).