Δέρας

The golden-fleeced skin, which Jason took after coming through the Black Sea with the Argonauts into Colchis, and [sc. taking also] Medea the daughter of the king Aietes. This was not as is reported in poetry, but it was a book written on skins, concerning how it is necessary that gold comes about through alchemy.¹ Therefore, the men of that time naturally called the skin "golden", because of the function which arose from it.