Define Nebulosity

(n.) A nebula.
(n.) The state or quality of being nebulous; cloudiness; hazeness; mistiness; nebulousness.
(n.) The stuff of which a nebula is formed.
(n.) The stuff of which a nebula is formed.
(n.) The state or quality of being nebulous; cloudiness; hazeness; mistiness; nebulousness.
(n.) A nebula.

by Webster's Revised Unabridged Dictionary

Nebulosity > define