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 nebula ['nɛbjʊlə]   添加此单词到默认生词本
n. 星云, 角膜云翳

[医] 薄翳; 角膜翳, 角膜云翳; 喷雾剂




    nebula
    nebulae
    [ noun ]
    1. a medicinal liquid preparation intended for use in an atomizer

    2. <noun.substance>
    3. cloudiness of the urine

    4. <noun.state>
    5. an immense cloud of gas (mainly hydrogen) and dust in interstellar space

    6. <noun.object>
    7. (pathology) a faint cloudy spot on the cornea

    8. <noun.attribute>


    Nebula \Neb"u*la\ (n[e^]b"[-u]*l[.a]), n.; pl. {Nebul[ae]}
    (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.]

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