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

 

corona

 noun
noun
BrE BrE//ˈrəʊ//
 
; NAmE NAmE//ˈroʊ//
 
(pl. coronae
BrE BrE//kəˈrəʊniː//
 
; NAmE NAmE//kəˈroʊniː//
 
)
(astronomy)(informal halo) The sun and the moon
 
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a ring of light seen around the sun or moon, especially during an eclipse See related entries: The sun and the moon Word Origin mid 16th cent. : from Latin, ‘wreath, crown’.
See the Oxford Advanced American Dictionary entry: corona