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kryptonite

noun

any surviving fragment of the exploded mythological planet Krypton, home of Superman

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  • If you buy a kryptonite bike lock and it can be defeated with a Bic pen, you're not getting very good security for your money.

    Little Brother Cory Doctorow
Word Origin and History for kryptonite
n.

fictional substance in the "Superman" series, where it weakens the otherwise invulnerable hero, 1943; perhaps from elements of krypton (which is a gas) + meteorite.

Online Etymology Dictionary, © 2010 Douglas Harper
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