rare earth

American  

noun

Chemistry.

1. the oxide of any of the rare-earth elements contained in various minerals.

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rare earth British  

noun

1. any oxide of a lanthanide

2. Also called: rare-earth element.  another name for lanthanide

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Etymology

Origin of rare earth

First recorded in 1875–80

Example Sentences

And even though the government has announced a plan to ramp up local production, China controls some 70-80% of lithium and cobalt refining and nearly 90% of rare earth separation, according to KPMG.

From BBC • Jun. 3, 2026

All of the rocks were enriched in dissolved CO2, an important ingredient that increases the likelihood of rare earth element concentration.

From Science Daily • May 26, 2026

Researchers have created a new global map showing where unusual volcanic rocks linked to rare earth elements are found, uncovering a striking connection to the oldest and thickest parts of Earth's continents.

From Science Daily • May 26, 2026

And he has slammed the "environmental devastation" caused by the "frenzied race" for rare earth elements, which are essential for modern electronics.

From Barron's • May 25, 2026

The same rare earth out of which the world famous Etruscan pottery is manufactured in the little village of Etrusca, near Milan, Italy.

From Young Wallingford by Chester, George Randolph