-jē noun
( -es )
Etymology: New Latin hydrologia, from Latin hydr- + -logia -logy
1. : a science dealing with the properties, distribution, and circulation of water ; specifically : the study of water on the surface of the land, in the soil and underlying rocks, and in the atmosphere, particularly with respect to evaporation and precipitation
2. : the physical factors studied by hydrologists (as precipitation, stream flow, snow melt, groundwater storage, and evaporation)
the hydrology of Mexico