Neb′u‐los″i‐ty (?), n. [L. nebulositas: cf. F. nébulosité] 1. The state or quality of being nebulous; cloudiness; haziness; mistiness; nebulousness.
The nebulosity... of the mother idiom. I. Disraeli.
2. (Astron.) (a) The stuff of which a nebula is formed. (b) A nebula.