Rare-earth-element definitions

râr'ûrth'
Any of the abundant metallic elements of atomic number 57 through 71.
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Any of the series of metallic chemical elements, with consecutive atomic numbers of 57 (lanthanum) through 71 (lutetium) inclusive.
noun
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(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.
noun
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Origin of rare-earth-element

rare earth