Definitions

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

  • n. Any of several rare-earth metals separable from other metals as a group and including europium, terbium, and gadolinium.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium

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