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Lavoesium
Lavoesium La*v[oe]"si*um, n. [NL., fr. Lavoisier, the
celebrated French chemist.] (Chem.)
A supposed new metallic element. It is said to have been
discovered in pyrites, and some other minerals, and to be of
a silver-white color, and malleable.
Meaning of Lavoesium from wikipedia