What does aquifer mean?
An aquifer is an underground layer of permeable material—typically sand, gravel, sandstone, or fractured rock—that holds groundwater and can supply usable amounts of it to wells and springs. The word belongs primarily to the vocabulary of geology and hydrology, but it appears frequently in everyday news reporting on water scarcity, pollution, and land subsidence, since aquifers feed much of the world's drinking and irrigation water. Hydrologists distinguish confined aquifers, which are trapped between impermeable layers and often under pressure, from unconfined ones, whose upper surface forms the water table. Because many aquifers refill only very slowly, they are often described as finite resources: heavy pumping can deplete them faster than rainfall can recharge them, and saltwater can intrude into coastal aquifers when freshwater pressure drops. The term carries a neutral, scientific tone, but its use often signals concern about sustainable water management.
nounA body of permeable rock, sand, or gravel underground that contains or transmits groundwater and can yield economically useful quantities of water to wells and springs.
- An underground layer of water-bearing permeable rock, sand, or gravel capable of yielding significant quantities of water to wells or springs.
"The city draws most of its drinking water from a vast aquifer beneath the coastal plain."
"Over-pumping has caused the aquifer to drop by several metres over the past two decades."
"Farmers across the region depend on the Ogallala Aquifer to irrigate their crops."
Standard plural; used when discussing multiple distinct groundwater-bearing layers or regional systems.
"Several major aquifers beneath the state have been designated for protection."
The Ogallala Aquifer under the American Great Plains supplies about a third of all irrigation water in the United States — and it took thousands of years to fill, but is being drained in decades.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aquifer
Aquifer derives from modern Latin, combining 'aqui-' (from Latin aqua, meaning water) with '-fer' (from Latin ferre, meaning to bear or carry), so literally 'water-bearer'; it was coined in French as aquifère before entering English in the late 19th century, around the time hydrogeology emerged as a discipline. It shares the aqua root with words such as aquatic, aquarium, and aqueduct, while the -fer element appears in related formations like conifer (cone-bearing) and carboniferous (carbon-bearing).
How aquifer is actually used
A technical term used chiefly in geology, hydrology, environmental science, and water-resource management; it also appears regularly in journalism about drought, groundwater depletion, and contamination. It is countable — one speaks of 'an aquifer' or 'aquifers' — though it is occasionally used more loosely for any groundwater source. Plural is aquifers; the adjective form is 'aquiferous'.
Easily confused with aquifer
Aquafer is simply a common misspelling of aquifer; the correct spelling uses the -ifer ending from Latin ferre.
An aqueduct is a man-made channel that conveys water from one place to another, whereas an aquifer is a natural underground layer that stores groundwater.