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

 

xenon

 noun
noun
BrE BrE//ˈzenɒn//
 
; NAmE NAmE//ˈzenɑːn//
 
; BrE BrE//ˈziːnɒn//
 
; NAmE NAmE//ˈziːnɑːn//
 
[uncountable](symbol Xe)
 
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a chemical element. Xenon is a gas that is found in very small quantities in the air and is used in some special electric lamps. Word Origin late 19th cent.: from Greek, neuter of xenos ‘strange’.
See the Oxford Advanced American Dictionary entry: xenon