noun
radium
RAY-dih-uhm
noun
1
A rare, highly radioactive metallic chemical element (symbol Ra).
"Marie Curie won a Nobel Prize for her discovery of radium."
How to Use Radium
Learner’s notesIn plain EnglishA dangerously radioactive metal element, famous for its role in early radioactivity research.
Common pairings
discovery of radium
radium poisoning
Word Forms
radiumed past tense, radiums plural, radiums singular
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Etymology
Borrowed from French radium, built from "radio(actif)" ("radioactive") plus the element-naming suffix "-ium".