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rare-earth element

DEFINITIONS OF: rare-earth element

1

n any element of the lanthanide series (atomic numbers 57 through 71)

Synonyms:
lanthanide, lanthanoid, lanthanon, rare earth
Types:
terbium metal
a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
Type of:
group, grouping
any number of entities (members) considered as a unit
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