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



BrE BrE//ˈkrɪptənaɪt//
; NAmE NAmE//ˈkrɪptənaɪt//
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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 American Dictionary entry: kryptonite