from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Water beneath the earth's surface, often between saturated soil and rock, that supplies wells and springs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Water that exists beneath the earth's surface in underground streams and aquifers.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. underground water that is held in the soil and in pervious rocks
Sorry, no etymologies found.
They gained an uncharacteristic hummock of land, a half mile across, from which the ground water had drained, more or less.
What water does not go up (by evapo-transpiration) must either be discharged to ground water or run off the land.
Griffith et al., “Cancer mortality in U.S. counties with hazardous waste sites and ground water pollution,” Archives of Environmental Health, vol. 44, no.