Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various oxides of the rare-earth elements.
  • n. A rare-earth element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. naturally occurring oxides of the lanthanide metals; they are widely distributed in relatively small concentrations and are used in glassmaking, ceramic glazes etc

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any element of the lanthanide series (atomic numbers 57 through 71)

Etymologies

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  • common ground - rarely refound
    an exercise of hum(us)ilty

    September 29, 2011

  • "The Prius hybrid automobile is popular for its fuel efficiency, but its electric motor and battery guzzle rare earth metals, a little-known class of elements found in a wide range of gadgets and consumer goods."
    --Reuters

    August 31, 2009