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



BrE BrE//ˈreɪdɒn//
; NAmE NAmE//ˈreɪdɑːn//
[uncountable](symbol Rn)
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a chemical element. Radon is a radioactive gas used in the treatment of diseases such as cancer. Word Origin early 20th cent.: from radium, on the pattern of argon.
See the Oxford Advanced American Dictionary entry: radon