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| thu·li·um [ thlee əm ] |
noun |
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| Definition: |
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gray metallic element: a very rare soft bright silvery gray metallic element of the lanthanide series. Source: monazite, bastnaesite. Use: X-ray source.
Symbol Tm
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| [Late 19th century. After Thule, most northerly region to the ancients; because first found in Norway] |
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