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rare-earth element

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rare-earth element

  [rair-urth]
Use rare-earth element in a Sentence
–noun Chemistry.
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:
1955–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rare-earth element   (râr'ûrth')
n.  Any of the abundant metallic elements of atomic number 57 through 71. Also called lanthanide.

[So called because they were originally thought to be rare.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

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