nautilus

Noun

• cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions

• cephalopod mollusk of warm seas whose females have delicate papery spiral shells

• a submarine that is propelled by nuclear power

Related words

• Synonyms: 
  chambered nautilus , pearly nautilus , paper nautilus , Argonaut , Argonauta argo , nuclear submarine , nuclear-powered submarine