Толковый словарь английского языка Oxford English Reference - radium
Radium
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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1.
noun Usage: often attributive Etymology: New Latin, from Latin radius ray Date: 1899 an intensely radioactive brilliant white metallic element that resembles barium chemically, occurs in combination in minute quantities in minerals (as pitchblende or carnotite), emits alpha particles and gamma rays to form radon, and is used chiefly in luminous materials and in the treatment of cancer ...Толковый словарь английского языка
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