3 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Europium \Eu*ro"pi*um\, n. [NL.; Europe + -ium, as in aluminium.] (Chem.) A metallic element of the rare-earth group (Lanthanide series), discovered spectroscopically by Demarcay in 1896. Symbol, Eu; atomic number 63; at. wt., 151.965 (C=12.011); valence = +2 or +3. [Webster 1913 Suppl. +PJC] From WordNet (r) 2.0 [wn]: europium n : a bivalent and trivalent metallic element of the rare earth group [syn: {Eu}, {atomic number 63}] From Elements database 20001107 [elements]: europium Symbol: Eu Atomic number: 63 Atomic weight: 151.25 Soft silvery metallic element belonging to the lanthanoids. Eu-151 and Eu-153 are the only two stable isotopes, both of which are {neutron} absorbers. Discovered in 1889 by Sir William Crookes.
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