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any surviving fragment of the exploded mythological planet Krypton, home of Superman's 21st Century Lexicon
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Examples from the Web for kryptonite
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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

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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