Origin: Greek suffix -ology
Hydrology has 2 different meanings across 1 category:
the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation
"The university hired a hydrologist to analyze local rainfall patterns and develop a strategy for conserving groundwater resources."
The science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere
"The team consulted an expert in hydrology to understand how recent rainfall patterns were altering groundwater levels beneath the city."