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n. pl. neb·u·los·i·ties
1. The quality or condition of being nebulous.
2. Astronomy
a. A nebula or a nebulalike object.
b. A mass of material constituting a nebula.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -ties
1. the state or quality of being nebulous
2. (Astronomy) astronomy a nebula
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌnɛb yəˈlɒs ɪ ti)

n., pl. -ties.
1. cloudy or cloudlike matter.
2. a nebulous form, shape, or mass.
3. the state or condition of being nebulous.
[1755–65; < Late Latin nebulōsitās]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
When she came close and looked in she beheld indistinct forms racing up and down to the figure of the dance, the silence of their footfalls arising from their being overshoe in "scroff"--that is to say, the powdery residuum from the storage of peat and other products, the stirring of which by their turbulent feet created the nebulosity that involved the scene.
Herbig-Haro objects like HH 7611, which are described as "bright patches of nebulosity near newborn stars,"&nbsp;will not be around as long as most objects in the universe.
None of four 200-inch plates taken in 1964, 1967, and 1968 shows any trace of Nebulosity ...
The current government in Macedonia is making effort with new investigations, allegedly inspired by someone's new evidence, but are in fact the same old nebulosity, to maintain the conspiracy theory--that someone far away was involved and crashed the place which President Boris Trajkovski died in, reads the editorial commentary in Sloboden Pecat.
Star members covered in nebulosity indicate more faint stars.
If you train any telescope or pair of binoculars at this spot, you will see an intricate web of nebulosity, over several degrees wide, with several hot, young stars at its centre.
William Herschel discovered the nebula in 1784, but I have been unable to find out who coined the name 'The Veil Nebula', though some use the name 'The Bridal Veil Nebula'--I suppose alluding to the wispy nature of the loop of nebulosity.
The picture shows a wealth of detail including several nodes of Hydrogen Alpha nebulosity denoting star forming regions showing up red in the outer spiral arms.
Initially the shock wave was moving at millions of kilometres per hour, but as it expanded through space it ploughed through the gas between the stars, which has slowed it considerably and created strangely shaped folds of nebulosity.
Binoculars will show a huge 2[degrees] glow, studded with stars and divided into sections by wisps of dark nebulosity. The largest nebulous mass contains the open cluster Trumpler 16, within which lies the remarkable star Eta Carinae.
great loop of nebulosity, being alive just as they are.
Gendler's photo not only captures the North America Nebula, it places it an unfamiliar context by showing the whole region wreathed in wispy nebulosity.