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

 

megadeath

 noun
noun
BrE BrE//ˈmeɡədeθ//
 
; NAmE NAmE//ˈmeɡədeθ//
 
(specialist)
 
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a unit for measuring the number of people killed in a nuclear war, equal to the deaths of a million people
See the Oxford Advanced American Dictionary entry: megadeath