aq·ui·fer

[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. 2013.
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Collins
World English Dictionary
aquifer (ˈækwɪfə) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Aquifer is always a great word to know.
So is interrobang. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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
Know the source of your drinking water-the river, lake, or aquifer that
  supplies your home.
The industry said it operated far below aquifer levels, so fracking would do no
  harm to water.
With flood irrigation, much of the water is not used by the plants and seeps
  back to the source, an aquifer or a river.
Also there is a significant potential for aquifer damage that cannot be
  repaired.
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