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Definition of kryptonite noun from the Oxford Advanced American Dictionary

 

kryptonite

 noun
noun
NAmE//ˈkrɪptəˌnaɪt//
 
[uncountable]
 
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a chemical element that exists only in stories, especially in stories about Superman, a character with special powers which he loses when he is near to kryptonite
See the Oxford Advanced Learner's Dictionary entry: kryptonite