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From Longman Dictionary of Contemporary English
Related topics: Elements
radiumra‧di‧um /ˈreɪdiəm/ noun [uncountable]  HCEa white metal that is radioactive and is used in the treatment of diseases such as cancer. It is a chemical element: symbol Ra
Examples from the Corpus
radiumThe early use of X-rays and radium for the treatment of cancer was very much a matter of trial and error.He developed cancer, and despite radium treatment - after which all his hair fell out - he was declared terminally ill.One curie is equal to the radioactivity of one gram of radium.Soon after, Marie Sklodowska-Curie made the crucial discovery and isolation of radium, a radioactive element.The radium clock will open the First Vault in three months.And the voice touched radium in me.
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