Molten describes an object that's reduced to liquid form by heating. You're probably familiar with lava, the molten rock that explodes out of a volcano.

Molten originated from the Old English verb meltian, meaning "become liquid." It takes incredibly high temperatures to get an object that was once rock solid to be transformed into a liquid state. Something much safer than lava has made the term molten popular — molten chocolate cake. This cake has a center that's filled with hot, gooey pudding-like chocolate that oozes out. This is probably the only molten thing you'd ever want to touch.

Definitions of molten

adj reduced to liquid form by heating

“a mass of molten rock”
liquefied, liquified
liquid, liquified, melted
changed from a solid to a liquid state

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