[TOP]radium ra·dium / ˈreidiəm / noun əu] (symb ɔa) a chemical element. ɔadium is a white radioactive metal used in the treatment of diseases such as cancer. 镭 [TOP]radium ra·di·um / ˈredɪəm ; ˈreɪdiəm / noun [U] 1. a white metal that is RADIOACTIVE and is used in the treatment of diseases such as CANCER . It is a chemical ELEMENT symbol Ra 镭〔一种化学元素，符号为 Ra〕 [TOP]radium['reɪ.di.əm] noun uncountable » a radioactive element which is used in the treatment of some diseases, especially cancer （尤指用于治疗癌症的）镭 [TOP]radium
1.N-UNCOUNT 不可数名词 镭Radium is a radioactive element which is used in the treatment of cancer.