希き土ど類るい

noun

rare earth

Chemistry term referring to a group of 17 metallic elements (scandium, yttrium, and the lanthanides). Often used in compounds like 希土類元素 (rare earth element) or 希土類磁石 (rare earth magnet).

• 希き土ど類るいはハイテク製せい品ひんに欠かかせない。

  Rare earths are essential for high-tech products.

• この磁じ石しゃくには希き土ど類るいが使つかわれている。

  Rare earths are used in this magnet.