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New American Oxford Dictionary

kryptonite

kryptonite |ˈkrɪptənʌɪt | ▶noun [ mass noun ] (in science fiction ) an alien mineral with the property of depriving Superman of his powers.

 

Oxford Dictionary

kryptonite

kryptonite |ˈkrɪptənʌɪt | ▶noun [ mass noun ] (in science fiction ) an alien mineral with the property of depriving Superman of his powers.