Definitions

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

  • n. See rare-earth element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any rare earth element of the lanthanide series (atomic numbers 57 through 71).

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

lanthan(um) + -ide.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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