- Rare earth is any of the seventeen metallic chemical elements found in atomic numbers 21, 39 and 57 through 71, typically found dispersed in deposits of chemicals with similar chemical properties.
An example of rare earth is cerium, a chemical oxidizing agent, that provides the yellow color in glass and acts as a catalyst for self-cleaning ovens.
rare earth definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- any of certain basic oxides much alike in physical and chemical properties; specif., any of the oxides of the rare-earth elements
- any of the rare-earth elements
rare earth definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Any of various oxides of the rare-earth elements.
- A rare-earth element.
rare earth - Medical Definition