Search Result for "atomic number 63":
Wordnet 3.0

NOUN (1)

1. a bivalent and trivalent metallic element of the rare earth group;
[syn: europium, Eu, atomic number 63]



WordNet (r) 3.0 (2006):

atomic number 63
    n 1: a bivalent and trivalent metallic element of the rare earth
         group [syn: europium, Eu, atomic number 63]