lanthanide

n.

1.

Any rare earth element of the lanthanide series (atomic numbers 57 through 71).

Noun

1.

lanthanide - any element of the lanthanide series (atomic numbers 57 through 71) Synonyms: lanthanoid, lanthanon, rare earth, rare-earth element

group, grouping, lanthanoid, lanthanon, rare earth, rare-earth element, terbium metal