rare-earth element

[ rair-urth ]
/ ˈrɛərˈɜrθ /

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.

Nearby words

  1. rare bird, a,
  2. rare book,
  3. rare earth,
  4. rare earths,
  5. rare gas,
  6. rare-earth metals,
  7. rarebit,
  8. raree show,
  9. rarefaction,
  10. rarefactive

Origin of rare-earth element

First recorded in 1955–60

Also called rare-earth metal.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


Medicine definitions for rare-earth element

rare-earth element

n.

lanthanide

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for rare-earth element

rare-earth element

[ râr′ûrth ]

See lanthanide.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.