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| ter·bi·um [ túrbee əm ] |
noun |
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| Definition: |
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silvery gray metallic element: a silvery gray metallic element of the rare-earth group. Source: monazite, bastnaesite. Use: lasers, X-rays, television tubes.
Symbol Tb
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| [Mid-19th century. After Ytterby, village in Sweden] |
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  ter·bic adjective |
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