GNU Collaborative International Dictionary of English

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  1.       
    Europium (?), 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]

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