Definition of nebula noun from the Oxford Advanced Learner's Dictionary

 

nebula

 noun
noun
BrE BrE//ˈnebjələ//
 
; NAmE NAmE//ˈnebjələ//
 
(pl. nebulae
BrE BrE//ˈnebjəliː//
 
; NAmE NAmE//ˈnebjəliː//
 
)
(astronomy) The universe
 
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a mass of dust or gas that can be seen in the night sky, often appearing very bright; a bright area in the night sky caused by a large cloud of stars that are far away See related entries: The universe Word Origin mid 17th cent. (as a medical term): from Latin, literally ‘mist’.
See the Oxford Advanced American Dictionary entry: nebula