nautĭlus or nautĭlŏs, i, m., = ναυτίλος,
the nautilus, a shell-fish so called because it sails like a vessel , Plin. 9, 29, 47, § 88; cf. nauplius and naviger.
·noun A variety of diving bell, the lateral as well as vertical motions of which are controlled, by ...
Webster's Dictionary of the English Language
The pearly nautilus, N. pompilius, is a marine animal, belonging to the same class (Cephalopoda) as ...
The Sailor's Word-Book