rare earth

noun

1

: any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals

2

: rare earth element

Examples of rare earth in a Sentence

Recent Examples on the Web

The non-binding memorandum of understanding on rare earths establishes a framework for cooperation between the two countries, focusing on reciprocal investment, exploration, mining and artificial intelligence applications, among other issues. —ABC News, 21 Feb. 2026

The team plans to further refine the material and test its ability to isolate additional rare earth elements. —Neetika Walter, Interesting Engineering, 20 Feb. 2026

While Washington and Beijing have relaxed export controls on semiconductors and rare earths, both have announced new AI models, new applications, and new deals. —Jared Cohen, Time, 18 Feb. 2026

Goldman Sachs has initiated research coverage of the miner Energy Fuels with a buy rating, citing the company's exposure to two big themes in the energy industry — uranium and rare earths. —Spencer Kimball, CNBC, 11 Feb. 2026

Word History

First Known Use

1875, in the meaning defined at sense 1

Rhymes for rare earth

• afterbirth
• berth
• birth
• dearth
• firth
• girth
• mirth
• worth
• childbirth
• rebirth
• stillbirth
• tamworth

Medical Definition

rare earth

noun

ˌrer-ˈərth 

1

: any of a group of similar oxides of metals or a mixture of such oxides occurring together in widely distributed but relatively scarce minerals

2

: rare earth element