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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rare earth

  • It was an ingenious application of the peculiar properties of rare-earth oxides.

    Artificial Light|M. Luckiesh
  • In such cases, Investigations had stepped in and the Martian or Earthling troublemaker had been sent to the rare-earth mines.

    Blind Spot|Bascom Jones

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

Medicine definitions for rare earth

rare earth


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