*vesbium*

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. It is not a recognized element. Actual identity? [ 1913 Webster ]