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rare earth Definition
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rare earth
noun(rare earth)any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals
rare earth
noun(rare earth)rare earth element
rare earth
noun(rare earth)any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium —called also rare earth metal