from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of various oxides of the rare-earth elements.
- noun A rare-earth element.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry
naturally occurring oxidesof the lanthanide metals; they are widely distributedin relatively small concentrationsand are used in glassmaking, ceramic glazesetc
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any element of the lanthanide series (atomic numbers 57 through 71)
from The American Heritage® Dictionary of the English Language, 4th Edition
[rare (because the minerals from which the rare-earth elements were first isolated are uncommon) + earth, metallic oxide.]
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