Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the abundant metallic elements of atomic number 57 through 71.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any element of the lanthanide series (atomic numbers 57 through 71)
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[rare earth.]
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