Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.
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.
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
the oxide of any of the rare-earth elements contained in various minerals.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Switch to new thesaurus
|Noun||1.||rare earth - any element of the lanthanide series (atomic numbers 57 through 71)|
terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.