
A permeable body of rock or regolith that both stores and transports groundwater.
Found on http://www.encyclo.co.uk/local/22291

A stratum of earth or permeable rock that stores significant quantities of water.
Found on http://www.encyclo.co.uk/local/20076

An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which is a bed of low permeability along ...
Found on http://en.wikipedia.org/wiki/Aquifer

(L: aqua water; ferre to bear) a layer of rock that holds water and allows water to percolate through it, horizontally and vertically.
Found on http://www.seafriends.org.nz/books/glossary.htm

[
n] - underground bed or layer yielding ground water for wells and springs etc
Found on http://www.webdictionary.co.uk/definition.php?query=aquifer

• A subsurface layer or layers of rock or other geological strata of sufficient porosity and permeability to allow either a significant flow of groundwater or the abstraction of significant quantities of groundwater. • Layers of rock, sand or gravel that can absorb water and allow it to...
Found on http://www.daviddarling.info/encyclopedia/A/AE_aquifer.html
noun underground bed or layer yielding ground water for wells and springs etc
Found on https://www.encyclo.co.uk/local/20974
(confined) soil or rock below the land surface that is saturated with water. There are layers of impermeable material both above and below it and it is under pressure so that when the aquifer is penetrated by a well, the water will rise above the top of the aquifer.
Found on http://www.translationdirectory.com/glossaries/glossary006.htm
(unconfined) an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.
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a bed or layer yielding water for wells and springs etc.; an underground geological formation capable of receiving, storing and transmitting large quantities of water. Aquifer types include: confined (sealed and possibly containing
Found on http://en.wikipedia.org/wiki/Glossary_of_environmental_science

A body of rock capable of allowing subterranean water to be stored, transmitted or issue yield as discharge and also capable of absorbing recharge.
Found on http://www.cancaver.ca/docs/glossary.htm

A body of rock that contains significant quantities of water that can be tapped by wells or springs.
Found on http://volcano.oregonstate.edu/glossary/1

A body of rock that contains significant quantities of water that can be tapped by wells or springs.
Found on http://www.encyclo.co.uk/local/21455

A body of rock through which appreciable amounts of water can flow. The rock of an aquifer must be porous and permeable (full of interconnected holes) so that it can conduct water. Aquifers are an important source of fresh water, for example for drinking and irrigation, in many arid areas of the world, and are exploited by the use of artesian wells...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0006348.html

A body of rock, often sandstone or limestone, that contains significant quantities of water that can be tapped by wells or springs. Much of the human popuation depends on aquifers for its water supply.
Found on http://www.daviddarling.info/encyclopedia/A/aquifer.html

a body of saturated rock or sediment through which water can move readily.
Found on http://en.wikipedia.org/wiki/Glossary_of_geology

A geologic formation that is water-bearing and which transmits water from one point to another.
Found on http://www.encyclo.co.uk/local/22047

A geologic formation that is water-bearing, and which transmits water from one point to another.
Found on https://www.encyclo.co.uk/local/20127

a geologic formation(s) that is water bearing. A geological formation or structure that stores and/or transmits water, such as to wells and springs. Use of the term is usually restricted to those water-bearing formations capable of yielding water in sufficient quantity to constitute a usable supply for people's uses.
Found on http://ga.water.usgs.gov/edu/dictionary.html

a geologic formation(s) that is water bearing. A geological formation or structure that stores and/or transmits water, such as to wells and springs. Use of the term is usually restricted to those water-bearing formations capable of yielding water in sufficient quantity to constitute a usable supply for people's uses.
Found on http://www.translationdirectory.com/glossaries/glossary006.htm

A geological unit containing suffieient saturated permeable rock to yield significant amounts of water.
Found on https://www.encyclo.co.uk/local/20501

A permeable formation that stores and transmits groundwater in sufficient quantity to supply wells.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html

A permeable layer of rock that retains water.
Found on http://www.quick-facts.co.uk/earth/glossary.html

A permeable region of rock or soil through which ground water can move.
Found on https://www.encyclo.co.uk/local/22327

A permeable stratum or zone below the earth's surface through which ground water moves.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html
No exact match found