rare earth
n.1. Any of various oxides of the rare-earth elements.
2. A rare-earth element.
[
rare (
because the minerals from which the rare-earth elements were first isolated are uncommon) +
earth,
metallic oxide.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
rare earth
n 1. (Elements & Compounds) any oxide of a lanthanide
2. (Elements & Compounds) Also called:
rare-earth element another name for
lanthanide Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
rare′ earth′
n. the oxide of any of the rare-earth elements contained in various minerals.
[1875–80]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun | 1. | rare earth - any element of the lanthanide series (atomic numbers 57 through 71)group, grouping - any number of entities (members) considered as a unit terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium |
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