- Arabic: راديُوم (rá:diyum) m .
- Armenian: ռադիում (ŕadium)
- Breton: radiom m .
- Bulgarian: радий (radij) m .
- Chinese: 鐳 (léi)
- Chinese Cantonese: 鐳 (lui4)
- Esperanto: radiumo
- French: radium
- Georgian: რადიუმი (radiumi)
- German: Radium n .
- Hebrew: רדיום (radiyum)
- Italian: radio m .
- Japanese: ラジウム (rajiumu), ラディウム (radiumu)
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- Korean: 라듐 (radyum)
- Persian: راديوم (radiyum)
- Polish: rad m .
- Portuguese: rádio m .
- Romanian: radiu n .
- Russian: радий (rádij) m .
- Spanish: radio
- Tamil: கருகன் (karugan)
- Thai: เรเดียม (rēdiam)
- Turkish: radyum
- Vietnamese: rađi
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