What is "molybdomancy"

n. divination by interpreting shapes formed when molten lead is dropped into water.

Molybdomancy (from ancient Greek μόλυβδος - molybdos "lead" + mancy, probably after Greek μολυβδομαντεία - molybdomanteia or French molybdomancie) is a technique of divination using molten metal. Typically molten lead or tin is dropped into water.