Kryptonite Definition

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

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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kryptonite