aquifer

[ak-wuh-fer]
noun
any geological formation containing or conducting ground water, especially one that supplies the water for wells, springs, etc.

Origin:
1900–05; probably < French aquifère (adj.); see aqui-, -fer

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
aquifer (ˈækwɪfə)
 
n
a porous deposit of rock, such as a sandstone, containing water that can be used to supply wells

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

aquifer
1901, coined from L. aqui-, comb. form of aqua "water" (see aqua-) + -fer "bearing," from ferre "to bear" (see infer).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aquifer   (āk'wə-fər)  Pronunciation Key 
An underground layer of permeable rock, sediment (usually sand or gravel), or soil that yields water. The pore spaces in aquifers are filled with water and are interconnected, so that water flows through them. Sandstones, unconsolidated gravels, and porous limestones make the best aquifers. They can range from a few square kilometers to thousands of square kilometers in size.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In conventional compressed-air storage, electricity is used to compress air,
  which is stored in underground caverns or aquifers.
Drinking water is pumped from aquifers that are generally hundreds, not
  thousands of feet deep.
In some areas, coastal aquifers are depleted of water before they can refill
  naturally, leading to the intrusion of seawater.
As it matures the efficiency and the process control will reduce the impact to
  adjacent aquifers.
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