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

radon

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

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