litharge/ˈlɪθɑːd͡ʒ/EtymologyFrom Middle English litarge, from Old French litarge, from Latin lithargyrus, from Ancient Greek λιθάργυρος (lithárguros), from λίθος (líthos, “stone”) + αργυρός (argurós, “silver”).litharge means lead monoxide (PbO) a toxic solid formed from oxidation of lead in air, and used as a pigment. Lexicurio rates it Sui generis — a strength score of 93 out of 100.nounlead monoxide (PbO) a toxic solid formed from oxidation of lead in air, and used as a pigment.“Yes: living among the cohabations^([sic]) of Faust himself, among the litharge and agate and hyacinth and pearls.”