the science dealing with the occurrence and distribution of underground water.
Origin of hydrogeology
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the branch of geology dealing with the waters below the earth's surface and with the geological aspects of surface waters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
The scientific study of the occurrence, distribution, and effects of groundwater.
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