| Pronunciation: | | `reydeeow'thowreeum
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 WordNet Dictionary |
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| | Definition: | |
[n] radioactive isotope of thorium with mass number 228 |
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RADIOTHORIUM is a 12 letter word that starts with R. |
| | Synonyms: | | thorium-228 |
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| | See Also: | | atomic number 90, Th, thorium |
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| Webster's 1913 Dictionary |
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| | Definition: | | \Ra`di*o*tho"ri*um\, n. (Chem.)
A radioactive substance apparently formed as a product from
thorium.
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