noun
northern sea nettle
A species of jellyfish (Chrysaora melanaster) found in northern waters. The name is usually written in katakana.
アカクラゲは北の海に生息するクラゲの一種だ。
The northern sea nettle is a type of jellyfish that lives in northern seas.
The name combines 赤 (aka, 'red') and 水母/クラゲ (kurage, 'jellyfish'), referring to its reddish coloration. The exact derivation is uncertain.