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Nautilus definitions

Webster's 1828 Dictionary

NAUTILUS, n. [L.,Gr. A ship] A genus of marine animals, whose shell consists of one spiral valve divided into several apartments by partitions. There are many species. This animal, when it sails, extends two of its arms, and between these supports a membrane that serves as a sail. With two other arms it rows or steers.
Learn of the little nautilus to sail.

WordNet (r) 3.0 (2005)

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 [syn: paper nautilus, nautilus, Argonaut, Argonauta argo]
3: cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions [syn: chambered nautilus, pearly nautilus, nautilus]

Merriam Webster's

noun (plural -luses or nautili) Etymology: New Latin, from Latin, paper nautilus, from Greek nautilos, literally, sailor, from naus ship Date: 1601 1. any of a genus (Nautilus) of cephalopod mollusks of the South Pacific and Indian oceans with a spiral chambered shell that is pearly on the inside called also chambered nautilus 2. paper nautilus

Oxford Reference Dictionary

n. (pl. nautiluses or nautili) 1 any cephalopod of the genus Nautilus with a light brittle spiral shell, esp. (pearly nautilus) one having a chambered shell with nacreous septa. 2 (in full paper nautilus) any small floating octopus of the genus Argonauta, of which the female has a very thin shell and webbed sail-like arms. Etymology: L f. Gk nautilos, lit. sailor (as NAUTICAL)

Webster's 1913 Dictionary

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["o]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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