metal
From LSJ
νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
Use copper, iron, silver, gold, etc.
metals: P. μεταλλεῖα, τά (Plato, Leges 678D; cf., Plato, Critias, 114E).
molten metal: V. μύδρος, ὁ.
