Noun
The state or quality of being nebulous; cloudiness; hazeness; mistiness; nebulousness.
The stuff of which a nebula is formed.
A nebula.
Source: Webster's dictionaryAn object may not only contain stars, but also nebulosity not composed of them. William Herschel
Nebulæ can be selected so that an insensible gradation shall take place from a coarse cluster like the Pleiades down to a milky nebulosity like that in Orion, every intermediate step being represented. This tends to confirm the hypothesis that all are composed of stars more or less remote. William Herschel
As a result of all this nebulosity, over the years the term "soundtrack" began to be commonly applied to any recording from a film, whether taken from the actual film soundtrack or re-recorded in the studio at an earlier or later time. Source: Internet
A larger amateur instrument reveals 8 more stars, nebulosity to the east and west of the cluster, and a diameter of 9 arcminutes. Source: Internet
Under the Trumpler scheme, the Pleiades are classified as I3rn (strongly concentrated and richly populated with nebulosity present), while the nearby Hyades are classified as II3m (more dispersed, and with fewer members). Source: Internet