Kryp ‧ ton ‧ ite /ˈkrɪptənaɪt/ BrE AmE noun [uncountable]
a type of rock that comes from the ↑ planet Krypton in the Superman stories. It is harmful to Superman.
Kryp ‧ ton ‧ ite /ˈkrɪptənaɪt/ BrE AmE noun [uncountable]
a type of rock that comes from the ↑ planet Krypton in the Superman stories. It is harmful to Superman.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012