lanthanide
1. [ noun ] (chemistry) any element of the lanthanide series (atomic numbers 57 through 71)
Synonyms: rare_earth lanthanoid lanthanon rare-earth_element
Related terms: group chemical_element terbium_metal
Similar spelling:   lanthanoid
  lanthanon
  Lanthanotidae
  lanthanum
  lawn_tennis
  Lanthanotus