Search Result for "lanthanide series":
Wordnet 3.0

NOUN (1)

1. the rare-earth elements with atomic numbers 57 through 71; having properties similar to lanthanum; 



WordNet (r) 3.0 (2006):

lanthanide series
    n 1: the rare-earth elements with atomic numbers 57 through 71;
         having properties similar to lanthanum