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From The Collaborative International Dictionary of English v.0.48:
Vesbium \Ves"bi*um\, n. [NL., from L. Vesuvius, contr. Vesbius, Vesuvius.] (Chem.) A rare metallic element of which little is known. It is said by Scacchi to have been extracted from a yellowish incrustation from the cracks of a Vesuvian lava erupted in 1631. Note: It is not a recognized element. Actual identity? [1913 Webster]