ground water

noun
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.


Origin:
1885–90

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ground water
 
n
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Boreholes also don't work in areas where there has been moving ground water
  during the past few centuries.
Even ground water used for drinking water is not free from viruses.
And unlike other herbicides that wind up in ground water, glyphosate stays
  where it's sprayed, degrading within weeks.
Or that you can contain ground water and aquifer contamination.
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