diffuse nebula
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.] [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Diffuse nebula — [ Orion Nebula, a famous diffuse nebula.] In astronomy, diffuse nebulae is the general term for illuminated nebulae. The three types of diffuse nebulae are reflection nebulae, emission nebulae and supernova remnants. They are diffuse as opposed… …   Wikipedia

  • diffuse nebula — noun a cluster of stars within an intricate cloud of gas and dust • Syn: ↑gaseous nebula • Hypernyms: ↑nebula • Hyponyms: ↑Orion, ↑Hunter * * * noun : any of the numerous luminous or dark formations …   Useful english dictionary

  • diffuse nebula — Astron. nebula (def. 1a). * * * …   Universalium

  • 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… …   The Collaborative International Dictionary of English

  • nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …   Universalium

  • Nebula — Nebulae redirects here. For the supercomputer in China, see Nebulae (computer). For other uses, see Nebula (disambiguation). The Pillars of Creation from the Eagle Nebula …   Wikipedia

  • nebula — Synonyms and related words: Black Magellanic Cloud, Crab Nebula, Gegenschein, bright diffuse nebula, coalsack, counterglow, dark cloud, dark nebula, diffuse nebula, dust cloud, gaseous nebula, nebula of Lyra, nebular hypothesis, nebulosity,… …   Moby Thesaurus

  • nebula — (Roget s IV) n. Syn. galaxy, galactic vapor, cloud cluster, nimbus, rarified gas, interstellar dust, luminous vapor. Kinds of nebulae include: spiral, planetary, diffuse, galactic, gaseous, whirlpool, ring; Crab nebula, nebula of Lyra, nebula of… …   English dictionary for students

  • Fox Fur Nebula — Diffuse nebula name = Fox Fur Nebula type = Diffuse + Dark epoch = J2000 ra = dec = dist ly = 2,700 ly appmag v = size v = constellation = Monoceros radius ly = absmag v = notes = names = NGC 2264 Fox Fur Nebula is a Nebula located in Monoceros… …   Wikipedia

  • Cave Nebula — Diffuse nebula caption = The Cave Nebula Courtesy Hunter Wilson name = Cave Nebula type = Emission epoch = J2000.0 ra = 22h 57m 17.14s dec = +62° 28 prime; 33.4 dist ly = 2400 ly appmag v = ?? size v = 50.0 x30.0 constellation = Cepheus radius ly …   Wikipedia

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