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)
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