Definition of krypton noun from the Oxford Advanced Learner's Dictionary

 

krypton

 noun
noun
BrE BrE//ˈkrɪptɒn//
 
; NAmE NAmE//ˈkrɪptɑːn//
 
[uncountable](symbol Kr)
 
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a chemical element. Krypton is a gas that does not react with anything, used in fluorescent lights and lasers. Word Origin late 19th cent.: from Greek krupton, neuter of kruptos ‘hidden’.
See the Oxford Advanced American Dictionary entry: krypton

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