rare earth element

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rare-earth element

[rair-urth]

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–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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Medical Dictionary

Main Entry: rare earth element
Function: noun
: any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of thelanthanide series and sometimes yttrium and scandium called also rare earth metal

Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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.

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