Etymology
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radium (n.)

radioactive metallic alkaline earth element, 1899, from French radium, formed in Modern Latin from Latin radius "ray" (see radius). With metallic element ending -ium. Named 1898 after identification by Marie Curie and her husband; so called for its power of emitting energy in the form of rays.

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Definitions of radium

radium (n.)
an intensely radioactive metallic element that occurs in minute amounts in uranium ores;
Synonyms: Ra / atomic number "
From wordnet.princeton.edu