IPA: /haɪˈdrɒmənsi/
KK: /haɪˈdrɒmənsi/
A method of predicting the future by observing water or its movements.
In ancient times, people practiced hydromancy to seek guidance and answers.
Hydromancy is formed from "hydro-" (from Greek "hydor", meaning water) and "mancy" (from Greek "manteia", meaning divination or prophecy). The word refers to the practice of divination using water.
Think of 'water' ('hydro-') being used for 'divination' ('mancy') — that's how hydromancy means predicting the future through water.