- The definition of hydrology is the branch of science or geology that studies the Earth's water.
The study of how the major bodies of water have shifted, expanded and changed land masses is an example of hydrology.
Origin of hydrologyModern Latin hydrologia: see hydro- and amp; -logy
- hy′dro·log′ic , hy′dro·log′i·cal
(usually uncountable, plural hydrologies)