Search Result for "lanthanoid": 
Wordnet 3.0

NOUN (1)

1. any element of the lanthanide series (atomic numbers 57 through 71);
[syn: rare earth, rare-earth element, lanthanoid, lanthanide, lanthanon]



WordNet (r) 3.0 (2006):

lanthanoid
    n 1: any element of the lanthanide series (atomic numbers 57
         through 71) [syn: rare earth, rare-earth element,
         lanthanoid, lanthanide, lanthanon]