Nebula
Pronunciation : Neb"u*la
Part of Speech : n.;
Etymology : [L., mist, cloud; akin to Gr. nebel mist, OHG. nebul, D. nevel, Skr. nabhas cloud, mist. Cf. Nebule.]
Definition : 1. (Astron.)
Defn: 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.]
pl. Nebul
Source : Webster's Unabridged Dictionary, 1913