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1. (n.) rare-earth element
any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar in having the same number of valence electrons. Also called rare-earth metal.
Etymology: (1955–60)
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| Definition of 'rare-earth element' |
Princeton's WordNet |
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1. (noun) rare earth, rare-earth element, lanthanoid, lanthanide, lanthanon
any element of the lanthanide series (atomic numbers 57 through 71)
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Definitions of rare-earth element 
