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From The Collaborative International Dictionary of English v.0.48:
Victorium \Vic*to"ri*um\, n. [NL. So named after Victoria, queen of Great Britain.] (Chem.) A probable chemical element discovered by Sir William Crookes in 1898. Its nitrate is obtained byy practical decomposition and crystallization of yttrium nitrate. At. wt., about 117. [Webster 1913 Suppl.]