artesian : Idioms & Phrases

• noun a well drilled through impermeable strata into strata that receive water from a higher altitude so there is pressure to force the water to flow upward
  artesian well.
  

WordNet

• noun a well drilled through impermeable strata into strata that receive water from a higher altitude so there is pressure to force the water to flow upward
  artesian well.
  

WordNet

• wells made by boring into the earth till the instrument reaches water, which, from internal pressure, flows spontaneously like a fountain. They are usually of small diameter and often of great depth.

Webster 1913