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

 

supernova

 noun
noun
BrE BrE//ˌsuːpəˈnəʊvə//
 
, BrE//ˌsjuːˈnəʊvə//
 
; NAmE NAmE//ˌsuːpərˈnoʊvə//
 
(pl. supernovae
BrE BrE//ˌsuːpəˈnəʊviː//
 
, BrE//ˌsjuːpəˈnəʊviː//
 
; NAmE NAmE//ˌsuːpərˈnoʊviː//
 
, supernovas)
(astronomy)
 
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a star that suddenly becomes much brighter because it is exploding compare nova
See the Oxford Advanced American Dictionary entry: supernova