chambered nautilus

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chambered nautilus (plural chambered nautiluses or chambered nautili)

  1. A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers.
    • 1956, Arthur C. Clarke, The City and the Stars, page 44:
      He was still prepared to go on collecting all that life could offer, like a chambered nautilus patiently adding new cells to its slowly expanding spiral.
  2. A nautilus, Nautilus pompilius.