There are 2 main definitions of nautilus in English:

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nautilus 1

Pronunciation: /ˈnɔːtɪləs/

noun (plural nautiluses or nautili /ˈnɔːtɪlʌɪ/ /ˈnɔːtɪliː/)

Image of nautilus
1A cephalopod mollusc with a light external spiral shell and numerous short tentacles around the mouth.
Example sentences
  • Some patterns in nature are formed by natural growth mechanisms, as with the spiral shape of the nautilus shell.
  • The beautiful nautilus shell is white to orange, with white stripes and a central, black whorl.
  • The shape of the museum is like a giant, spiral seashell - a nautilus - made of concrete.
2 (also paper nautilus) another term for argonaut.

Origin

Modern Latin, from Latin, from Greek nautilos, literally 'sailor'.

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There are 2 main definitions of nautilus in English:

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Nautilus 2

Pronunciation: /ˈnɔːtɪləs/
The first nuclear-powered submarine, launched in 1954. This US navy vessel made a historic journey (1-5 August 1958) under the ice of the North Pole.

Origin

A name previously given to Robert Fulton's ‘diving boat’ (1800), also to the fictitious submarine in Jules Verne's Twenty Thousand Leagues under the Sea.

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