Source : Webster's Revised Unabridged Dictionary (1913)

Europium \Eu*ro"pi*um\, n. [NL.; Europe + -ium, as in
   aluminium.] (Chem.)
   A metallic element of the rare-earth group, discovered
   spectroscopically by Demarcay in 1896. Symbol, Eu; at. wt.,
   152.0.

Source : WordNet®

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