victorium

from The Century Dictionary.

• noun The second name given by Sir William Crookes to a supposed new chemical element of the yttrium group which he had at first called monium.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.