ra.don

<名詞>
『化學』氡


n [U] [Date: 1900-2000; Origin: radium]
a radioactive gas that is used in the treatment of diseases such as cancer. It is a chemical element: symbol Rn
Similar Words
 - radium

 - radium therapy

 - radius

 - radix

 - radome

 * radon

 - RAF

 - raff

 - raffia

 - raffish

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