nautilus

[ nawt-l-uh s, not- ]
/ ˈnɔt l əs, ˈnɒt- /

noun, plural nau·ti·lus·es, nau·ti·li [nawt-l-ahy, not-] /ˈnɔt lˌaɪ, ˈnɒt-/ 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.

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Origin of nautilus

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for nautilus

nautilus
/ (ˈnɔːtɪləs) /

noun plural -luses or -li (-ˌlaɪ)

any cephalopod mollusc of the genus Nautilus, esp the pearly nautilus
short for paper nautilus

Word Origin for nautilus

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