Definitions from Wiktionary (nautilus)

▸ noun:  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.
▸ noun:  A kind of diving bell that sinks or rises by means of compressed air.
▸ noun:  A paper nautilus (actually an octopus).
▸ Also see nautilus


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