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BNC: 17806 COCA: 18058

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.氡(放射性化学元素)
    Word Originearly 20th cent.: from radium, on the pattern of argon.

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