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

 

megastar

 noun
noun
BrE BrE//ˈmeɡəstɑː(r)//
 
; NAmE NAmE//ˈmeɡəstɑːr//
 
(informal) Celebrity news, Film people
 
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a very famous singer, actor or entertainer See related entries: Celebrity news, Film people
See the Oxford Advanced American Dictionary entry: megastar