ground water

the water beneath the surface of the ground, consisting largely of surface water that has seeped down: the source of water in springs and wells.
Also, groundwater.

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ground water
underground water that has come mainly from the seepage of surface water and is held in pervious rocks

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
groundwater   (ground'wô'tər)  Pronunciation Key 
Water that collects or flows beneath the Earth's surface, filling the porous spaces in soil, sediment, and rocks. Groundwater originates from rain and from melting snow and ice and is the source of water for aquifers, springs, and wells. The upper surface of groundwater is the water table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

groundwater definition

Water that seeps through the soil or rocks underground.

Note: Groundwater is a source of drinking and spring water for many communities.
Note: Groundwater can be contaminated by chemical pollutants. (See water pollution.)
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Normally, groundwater pollution from cattle feedlots is a serious problem.
In some places, the groundwater is too salty to drink.
There is some chemical that can get into groundwater and it's bad for fish and
The sandstone was washed away by groundwater that created pipe-shaped cavities
  in the sandstone.
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