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rare earth

noun Chemistry.

the oxide of any of the rare-earth elements contained in various minerals.

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Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Rare earth is always a great word to know.

So is combustion. Does it mean:

of or containing titanium, especially in the tetravalent state or three valence state

rapid oxidation accompanied by heat and light, or a chemical combination attended by production of heat and light

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Collins

World English Dictionary

rare earth

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

rare earth n.
See lanthanide.

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