\Neb`u*los"i*ty\, n. [L. nebulositas: cf. F.
n['e]bulosit['e]]
1. The state or quality of being nebulous; cloudiness;
   hazeness; mistiness; nebulousness.
         The nebulosity . . . of the mother idiom. --I.
                                               Disraeli.
2. (Astron.)
   (a) The stuff of which a nebula is formed.
   (b) A nebula.