- a fictional material (either a metal or crystalline mineral) that has a detrimental effect on Superman
- a fictional metal element from the planet Krypton. The most common form is the green element which is deadly to Superman and other super powered kryptonians, but there are also many other forms. red, black, white, gold, blue and jewel to name a few. Each one having various effects on super powered kryptonians.
- Dutch: kryptoniet
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