noun
greater argonaut; paper nautilus
A pelagic octopus (Argonauta argo) known for the paper-thin shell secreted by the female. Often called 'paper nautilus' in English.
See also: 葵貝
カイダコは暖かい海に生息するタコの仲間です。
The greater argonaut is a type of octopus that lives in warm seas.
メスのカイダコは薄い貝殻のようなものを作ります。
The female greater argonaut creates a thin, shell-like structure.
Another name for the greater argonaut or its shell; less common than カイダコ.
Compound of 貝 (kai, 'shell') and 蛸 (tako, 'octopus'), referring to the shell-like egg case of the female argonaut. The exact historical derivation is uncertain.