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Neb"ula (), n.; pl. Nebul (). [L., mist, cloud; akin to Gr. , , 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. True nebul are gaseous; but very distant star clusters often appear like them in the telescope. 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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