[nawt-l-uhs, not-]
noun, plural nautiluses, nautili [nawt-l-ahy, not-] , for 1, 2.
Also called chambered nautilus, pearly nautilus. any cephalopod of the genus Nautilus, having a spiral, chambered shell with pearly septa.
(initial capital letter) the first nuclear-powered submarine launched by the U.S. Navy.

1595–1605; < Latin < Greek nautílos paper nautilus, literally, sailor, derivative of naûs ship; the webbed dorsal arms of the paper nautilus were thought to have been used as sails Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nautilus (ˈnɔːtɪləs)
n , pl -luses, -li
1.  any cephalopod mollusc of the genus Nautilus, esp the pearly nautilus
2.  short for paper nautilus
[C17: via Latin from Greek nautilos sailor, from naus ship]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

marine cephalopod, 1601, from L. nautilus, in Pliny a kind of marine snail (including also squid, cuttlefish, polyps, etc.), from Gk. nautilos, "paper nautilus," lit. "sailor," from nautes "sailor," from naus "ship" (see naval). The cephalopod was formerly thought to use its webbed arms as sails.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nautilus eventually overcame this problem during four additional field tests.
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