noun, plural neb·u·los·i·ties.
Examples from the Web for nebulosity
Prof. Barnard adds that the nebulosity is easily visible in a 12-inch telescope.Astronomical Curiosities|J. Ellard Gore
It is the nebulosity out of which the whole came and into which all is ultimately occluded.The Mystery of Space|Robert T. Browne
There are bristled comets; these resemble the skins of beasts with the fur on them, and are surrounded by a nebulosity.Astronomy for Amateurs|Camille Flammarion
Repeating the photographs at intervals, it was found that this nebulosity was rapidly changing in shape.Astronomical Discovery|Herbert Hall Turner
By going back as far as possible, we thus arrive at a nebulosity so diffused that its existence could hardly be suspected.A History of Science, Volume 3(of 5)|Henry Smith Williams