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nebula    音標拼音: [n'ɛbjələ]
n. 星云,云翳

星雲,雲翳

nebula
n 1: a medicinal liquid preparation intended for use in an
atomizer
2: cloudiness of the urine
3: an immense cloud of gas (mainly hydrogen) and dust in
interstellar space
4: (pathology) a faint cloudy spot on the cornea

Nebula \Neb"u*la\ (n[e^]b"[-u]*l[.a]), n.; pl. {Nebulae}
(n[e^]b"[-u]*l[=e]). [L., mist, cloud; akin to Gr. nefe`lh,
ne`fos, cloud, mist, G. nebel mist, OHG. nebul, D. nevel,
Skr. nabhas cloud, mist. Cf. {Nebule}.]
1. (Astron.) A faint, cloudlike, self-luminous mass of matter
situated beyond the solar system among the stars. The term
was originally applied to any diffuse luminous region.
Now, technically, it is applied to interstellar clouds of
dust and gases ({diffuse nebula}). However distant
galaxies and very distant star clusters often appear like
them in the telescope, such as the {spiral nebula} in
Andromeda, known now to be a distant galaxy.
[1913 Webster PJC]

2. (Med.)
(a) A white spot or a slight opacity of the cornea.
(b) A cloudy appearance in the urine. [Obs.]
[1913 Webster]



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英文字典中文字典相關資料:
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    What Is a Nebula? The Short Answer: A nebula is a giant cloud of dust and gas in space Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova Other nebulae are regions where new stars are beginning to form
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    Nebula, any of the various tenuous clouds of gas and dust that occur in interstellar space The term was formerly applied to any object outside the solar system that had a diffuse appearance rather than a pointlike image, as in the case of a star
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