noun
Japanese moon moth; emperor moth
A large, pale green moth native to Japan; scientific name Actias artemis (formerly Actias gnoma).
オオミズアオは夜に灯りに集まる大きな蛾です。
The Japanese moon moth is a large moth that gathers around lights at night.
庭でオオミズアオを見つけた。
I found a Japanese moon moth in the garden.
The name 大水青 (literally 'large water blue') refers to the moth's pale bluish-green wings. The exact origin of the name is uncertain.