radioactive metallic element, 1899, from French radium, named 1898 after identification by Marie Curie and her husband, formed in Modern Latin from Latin radius "ray" (see radius). With metallic element ending -ium. So called for its power of emitting energy in the form of rays.
radiometric
radioscopy
radio-telephone
radiotherapy
radish
radium
radius
Radnor
radon
radula
raffia
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