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rare earth

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

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rare earth

Historical Examples

  • 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

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

    Artificial Light

    M. Luckiesh


British Dictionary definitions for rare earth

rare earth

noun
  1. any oxide of a lanthanide
  2. Also called: rare-earth element another name for lanthanide
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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

rare earth in Medicine

rare earth

n.
  1. lanthanide