From Longman Dictionary of Contemporary Englishradiumra‧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
radium• The 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.Origin radium (1800-1900) Modern Latin Latin radius; → RADIUS 