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rare-earth element

[rair-urth] /ˈrɛərˈɜrθ/
noun, Chemistry
1.
any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons.
Also called rare-earth metal.
Origin
1955-1960
1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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rare earth metal in Medicine

rare-earth element 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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rare earth metal in Science
rare-earth element
  (râr'ûrth')   
See lanthanide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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