Would you please tell me the meaning of this word?
Thanks in advance,
according to webster:
hidden, a colorless relatively inert gaseous element found in air at about one part per million and used esp. in electric lamps
hope it helps
Matilda, the definition you quote refers to Krypton, a chemical element, an inert gas with a symbol Kr.
Kryptonite, however, belongs to a more unrealistic sphere; it's a fragment of the mythological planet Krypton; the authors of 'The Superman' placed their hero's home on it.
Kryptonite is also used as a brand name of some companies and their products.
In addition to what Tomasz said, kryptonite, because it was poisonous to Superman, can be used for something that is poisonous or destructive.
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