nebulosity

Neb`u*los"i*ty, n. Etym: [L. nebulositas: cf. F. nébulosité] 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.

---