1
Stage 1 of 3
radius
Latin · ancient
"ray, beam"
ray, beam, referring to the rays it emits
2
Stage 2 of 3
radium
French · 1898
"the radioactive element discovered by the Curies"
coined by Marie and Pierre Curie for the intensely radioactive element they discovered
3
Stage 3 of 3
radium
English · 1899
"a rare, highly radioactive metallic element"
adopted directly for the glowing radioactive element
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