from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The set of chemically related elements with properties similar to those of lanthanum, with atomic numbers from 57 to 71; the rare-earth elements.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the rare-earth elements with atomic numbers 57 through 71; having properties similar to lanthanum
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