Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun radium

1 sense of radium

Sense 1
radium, Ra, atomic number 88 -- (an intensely radioactive metallic element that occurs in minute amounts in uranium ores)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)