nautili; nautiluses

Definitions of nautilus
  1. noun
    cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
    synonyms: chambered nautilus, pearly nautilus
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    type of:
    cephalopod, cephalopod mollusk
    marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles
  2. noun
    cephalopod mollusk of warm seas whose females have delicate papery spiral shells
    synonyms: Argonaut, Argonauta argo, paper nautilus
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    type of:
    a cephalopod with eight arms but lacking an internal shell
  3. noun
    a submarine that is propelled by nuclear power
    synonyms: nuclear submarine, nuclear-powered submarine
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    type of:
    U-boat, pigboat, sub, submarine
    a submersible warship usually armed with torpedoes
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