Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Modern Latin
Origin: Latin radius; RADIUS

radium

 noun
     
Related topics: Elements
ra‧di‧um [uncountable]
HCE a white metal that is radioactive and is used in the treatment of diseases such as cancer. It is a chemical element: symbol Ra
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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