Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

Etymologies

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

Examples

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