radiumnoun [ U ]uk /ˈreɪ.di.əm/ us /ˈreɪ.di.əm/ symbol Ra
- His medicine, Radithor, had a very dangerous chemical called radium in it.
- She discovered radium, but she often forgot to eat.
(Definition of “radium” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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