neb·u·los·i·ty

[neb-yuh-los-i-tee]
noun, plural neb·u·los·i·ties.
1.
nebulous or nebular matter.
2.
a nebulous form, shape, or mass.
3.
the state or condition of being nebulous.

Origin:
1755–65; < Late Latin nebulōsitās. See nebulose, -ity

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World English Dictionary
nebulosity (ˌnɛbjʊˈlɒsɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the state or quality of being nebulous
2.  astronomy a nebula

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Nebulosity is always a great word to know.
So is flibbertigibbet. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a chattering or flighty, light-headed person.
Example sentences
Not having seen the object, my guess is that your observant student has caught a bit of nebulosity or a unique formation of stars.
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