rare earth element

/R EH1 R ER0 TH EH0 L AH0 M AH0 N T/
noun
  1. 1

    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.

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Source: https://en.wiktionary.org/wiki/rare%20earth%20element