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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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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

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