RADON


Meaning of RADON in English

/ ˈreɪdɒn; NAmE -dɑːn/ noun

[ U ] ( symb Rn ) a chemical element that is a radioactive gas used in the treatment of diseases such as cancer.

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WORD ORIGIN

early 20th cent.: from radium , on the pattern of argon .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.