Kryptonite Definition

noun
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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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

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