Definition of 'nautilus'

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Noun

1. a submarine that is propelled by nuclear power
      Synonyms: nuclear submarine nuclear-powered submarine
2. cephalopod mollusk of warm seas whose females have delicate papery spiral shells
      Synonyms: paper nautilus Argonaut Argonauta argo
3. cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
      Synonyms: chambered nautilus pearly nautilus

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