What is the origin of plumbeous?
Plumbeous comes straight from the Latin adjective plumbeus “made of lead, leaden, (of coins) base,” a derivative of the noun plumbum. Plumbum is a noun of unknown etymology, and linguists have speculated on the connection between plumbum and Greek mólybdos with its variants mólibos and bólimos, which also have no reliable etymology. In ancient times lead was mined in Attica (i.e., the territory whose capital was Athens), Macedonia, Asia Minor (Anatolia), Etruria, Sardinia, Gaul (France), Britain, and Spain. Many scholars think that the Greek and Latin words derive from an Iberian (Spanish) language, and the Basque word for lead, berun, supports this. Plumbeous entered English in the 16th century.