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nautilus

[nawt-l-uh s, not-] /ˈnɔt l əs, ˈnɒt-/
noun, plural nautiluses, nautili
[nawt-l-ahy, not-] /ˈnɔt lˌaɪ, ˈnɒt-/ (Show IPA),
for 1, 2.
1.
Also called chambered nautilus, pearly nautilus. any cephalopod of the genus Nautilus, having a spiral, chambered shell with pearly septa.
3.
(initial capital letter) the first nuclear-powered submarine launched by the U.S. Navy.
Origin
1595-1605
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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nautili

nautilus

/ˈnɔːtɪləs/
noun (pl) -luses, -li (-ˌlaɪ)
1.
any cephalopod mollusc of the genus Nautilus, esp the pearly nautilus
2.
short for paper nautilus
Word Origin
C17: via Latin from Greek nautilos sailor, from naus ship
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nautili

nautilus

n.

marine cephalopod, c.1600, from Latin nautilus, in Pliny a kind of marine snail (including also squid, cuttlefish, polyps, etc.), from Greek nautilos "paper nautilus," literally "sailor," from nautes "sailor," from naus "ship" (see naval). The cephalopod formerly was thought to use its webbed arms as sails.

Online Etymology Dictionary, © 2010 Douglas Harper
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