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| lan·tha·num [ lánthənəm ] |
noun |
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| Definition: |
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metallic element: a silvery ductile metallic element resembling aluminum that belongs to the rare-earth group. Source: monazite, bastnaesite. Use: glass manufacture.
Symbol La
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| [Mid-19th century. < Greek lanthanein "lie hidden"; because it was discovered hidden in cerium oxide] |
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