noun
great green turban; Turbo marmoratus
A large marine snail with a thick, often iridescent shell; found in the Indo-Pacific. The shell is used for decorative purposes.
沖縄ではヤコウガイの貝殻がお土産として売られている。
In Okinawa, great green turban shells are sold as souvenirs.
ヤコウガイは夜に活動する巻貝の一種
The great green turban is a type of sea snail that is active at night.
The name 夜光貝 (literally 'night-light shell') refers to the shell's iridescent inner layer, which can reflect light. The exact historical derivation is uncertain.