Search Result for "actinide": 
Wordnet 3.0

NOUN (1)

1. any of a series of radioactive elements with atomic numbers 89 through 103;
[syn: actinoid, actinide, actinon]



WordNet (r) 3.0 (2006):

actinide
    n 1: any of a series of radioactive elements with atomic numbers
         89 through 103 [syn: actinoid, actinide, actinon]