NAUTILUS
nautilus, nuclear submarine, nuclear-powered submarine
(noun) a submarine that is propelled by nuclear power
Source: WordNet® 3.1
Etymology
Noun
nautilus (plural nautiluses or nautili)
A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers, of which Nautilus is the type genus.
A kind of diving bell that sinks or rises by means of compressed air.
Synonyms
• chambered nautilus
Source: Wiktionary
Nau"ti*lus, n.; pl. E. Nautiluses, L. Nautili. Etym: [L., fr. gr.
Nave of a church.]
1. (Zoöl.)
Definition: The only existing genus of tetrabranchiate cephalopods. About
four species are found living in the tropical Pacific, but many other
species are found fossil. The shell is spiral, symmetrical, and
chambered, or divided into several cavities by simple curved
partitions, which are traversed and connected together by a
continuous and nearly central tube or siphuncle. See Tetrabranchiata.
Note: The head of the animal bears numerous simple tapered arms, or
tentacles, arranged in groups, but not furnished with suckers. The
siphon, unlike, that of ordinary cephalopods, is not a closed tube,
and is not used as a locomotive organ, but merely serves to conduct
water to and from the gill cavity, which contains two pairs of gills.
The animal occupies only the outer chamber of the shell; the others
are filled with gas. It creeps over the bottom of the sea, not coming
to the surface to swim or sail, as was formerly imagined.
2. The argonaut; -- also called paper nautilus. See Argonauta, and
Paper nautilus, under Paper.
3. A variety of diving bell, the lateral as well as vertical motions
of which are controlled, by the occupants.
Source: Webster’s Unabridged Dictionary 1913 Edition