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Kryptonite meaning, definition, what is Kryptonite: a type of rock that comes from the plane...: Learn more.
Definition of kryptonite noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
"Superman" series, where it weakens the otherwise invulnerable hero, 1943; perhaps from… See origin and meaning of kryptonite.