Pronunciation: (nôt'l-us, not'-), [key]
—pl. nau•ti•lus•es, nau•ti•liPronunciation: (nôt'l-ī", not'-) [key] for 1, 2.
1. Also called chambered nautilus, pearly nautilus. any cephalopod of the genus Nautilus, having a spiral, chambered shell with pearly septa.
2. See paper nautilus.
3. (cap.) the first nuclear-powered submarine launched by the U.S. Navy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.