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nautilus    音標拼音: [n'ɔtələs]
n. 鸚鵡螺,缸魚,鸚鵡螺號

鸚鵡螺,缸魚,鸚鵡螺號

nautilus
n 1: a submarine that is propelled by nuclear power [synonym:
{nautilus}, {nuclear submarine}, {nuclear-powered
submarine}]
2: cephalopod mollusk of warm seas whose females have delicate
papery spiral shells [synonym: {paper nautilus}, {nautilus},
{Argonaut}, {Argonauta argo}]
3: cephalopod of the Indian and Pacific oceans having a spiral
shell with pale pearly partitions [synonym: {chambered nautilus},
{pearly nautilus}, {nautilus}]

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. (Zool.) 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}.
[1913 Webster]

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.
[1913 Webster]

2. The argonaut; -- also called {paper nautilus}. See
{Argonauta}, and {Paper nautilus}, under {Paper}.
[1913 Webster]

3. A variety of diving bell, the lateral as well as vertical
motions of which are controlled, by the occupants.
[1913 Webster]

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英文字典中文字典相關資料:
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