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rare earth

noun, Chemistry.
the oxide of any of the rare-earth elements contained in various minerals.
Origin of rare earth
First recorded in 1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for rare earth

rare earth

any oxide of a lanthanide
Also called rare-earth element another name for lanthanide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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rare earth in Medicine

rare earth n.
See lanthanide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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