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rare-earth element

[rair-urth]
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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.

Origin of rare-earth element

First recorded in 1955–60
Also called rare-earth metal.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
rare-earth metal in Medicine

rare-earth element

n.
  1. lanthanide

rare-earth metal in Science

rare-earth element

[râr′ûrth]
  1. See lanthanide.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.