Noun nautilus has 3 senses
- nautilus, nuclear submarine, nuclear-powered submarine - a submarine that is propelled by nuclear power
--1 is a kind of submarine, pigboat, sub, U-boat
- paper nautilus, nautilus, Argonaut, Argonauta argo - cephalopod mollusk of warm seas whose females have delicate papery spiral shells
--2 is a kind of octopod
--2 is a member of Argonauta, genus Argonauta
- chambered nautilus, pearly nautilus, nautilus - cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
--3 is a kind of cephalopod, cephalopod mollusk
--3 is a member of genus Nautilus
,