lanthanoid

Definitions of lanthanoid

1. noun

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

   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