Rare-earth metal



[rair-urth] /ˈrɛərˈɜrθ/

noun, Chemistry.
1.
any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons.

rare-earth element n.
See lanthanide.
rare-earth element
(râr’ûrth’)
See lanthanide.

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