- the oxide of any of the rare-earth elements contained in various minerals.
Origin of rare earth
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Related Words for rare earthoxide
Examples from the Web for rare earth
Historical Examples of rare earth
- any oxide of a lanthanide
- Also called: rare-earth element another name for lanthanide
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