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corona

noun [C usually singular]
 
 
/kəˈrəʊ.nə/ US  /-ˈroʊ-/ (plural coronae /-niː/ US  /-niː/) specialized

Definition

a circle of light that can sometimes be seen around the moon at night, or around the sun during an eclipse (= a time when the moon is positioned exactly between the sun and the Earth)Astronomy - general words
(Definition of corona noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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