nautilus

中文： 鹦鹉螺

1. A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers, of which Nautilus is the type genus.
2. A kind of diving bell that sinks or rises by means of compressed air.
3. A paper nautilus (actually an octopus).

复数 nautiluses