- The definition of an aquifer is a natural well created by an underground rock or other geological formation.
An example of an aquifer is The Great Artesian Basin.
an underground layer of porous rock, sand, etc. containing water, into which wells can be sunk
Origin of aquiferModL: see aqua and amp; -fer
An underground layer of permeable rock, sediment, or soil that yields water. Aquifers can range from a few square kilometers to thousands of square kilometers in size.