Kryptonite meaning

The definition of kryptonite is Superman's ultimate weakness, or anything that causes someone's ultimate weakness.

An example of kryptonite is the one food a person is seriously allergic to.

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The one weakness of something or someone that is otherwise invulnerable, an Achilles' heel.
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Origin of kryptonite

  • From a fictional radioactive element, kryptonite, that has a detrimental effect on the otherwise invulnerable character Superman. Apparently formed as krypton +‎ -ite.

    From Wiktionary