n. The geology of groundwater, especially concerning the physical, biological and chemical properties of its occurrence and movement.
The Century Dictionary and Cyclopedia
n. The geology of water; that part of geological science which has to do with the relations of water standing or flowing beneath the surface of the earth.
Word Usage
"Dr. Reza claimed, "Prof. Jiin-Shuh Jean has great potential in hydrogeology which is related to my research background."