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English Dictionary: nautilus by the DICT Development Group
2 results for nautilus
From WordNet (r) 3.0 (2006) [wn]:
nautilus
n
  1. a submarine that is propelled by nuclear power [syn: nautilus, nuclear submarine, nuclear-powered submarine]
  2. cephalopod mollusk of warm seas whose females have delicate papery spiral shells
    Synonym(s): paper nautilus, nautilus, Argonaut, Argonauta argo
  3. cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
    Synonym(s): chambered nautilus, pearly nautilus, nautilus
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Nautilus \Nau"ti*lus\, n.; pl. E. {Nautiluses}, L. {Nautili}.
      [L., fr. gr. nayti`los a seaman, sailor, a kind of shellfish
      which was supposed to be furnished with a membrane which
      served as a sail; fr. nay^s ship. See {Nave} of a church.]
      1. (Zo[94]l.) 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.
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