transcription, транскрипция: [ ˈreɪdjəm ]
n. Chem. a radioactive metallic element orig. obtained from pitchblende etc., used esp. in luminous materials and in radiotherapy. °Symb.: Ra. øradium 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. [L radius ray]