hydromancy

Etymology

From French hydromancie or Late Latin hydromantia, from Ancient Greek ὑδρομαντεία (hudromanteía); corresponding to hydro- + -mancy.

noun

  1. Divination by water or other liquid.“Hydromancy is the supposed art of divining by water. The Persians, according to Varro, invented it; Pythagoras and Numa Pompilius made use of it; and we still admire the like wonderful prognosticators.”