| 单词 | radium |
| 释义 | radium n. Chem. a radioactive metallic element orig. obtained from pitchblende etc., used esp. in luminous materials and in radiotherapy. Usage Symb.: Ra. Phrases and idioms radium bomb a container holding a large quantity of radium and used in radiotherapy as a source of gamma rays. radium emanation = RADON. radium therapy the treatment of disease by the use of radium. Etymology: L radius ray |
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