molten UK /ˈmɒltən/US /ˈmoʊltən/ adjective3 •Melted, especially due to great heatEarth is surrounded by a magnetosphere — an invisible bubble of magnetism generated by the powerful churning of molten metals at Earth’s core. — 2023 •Glowing red-hot. •Made from a melted substance. formsmore molten · most molten