rare earth

Noun
  1. Any element of the lanthanide series (atomic numbers 57 through 71) (synset 114648921)
    is a type of: group, grouping - any number of entities (members) considered as a unit
    subtypes: terbium metal - a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium
    same as: lanthanide, lanthanoid, lanthanon, rare-earth element

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