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.
User Defined Definitions
"a submarine that is propelled by nuclear power"
"cephalopod mollusk of warm seas whose females have delicate papery spiral shells"
"cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions"