noting, pertaining to, or characteristic of an artesian well.

1820–30; < French artésien pertaining to Artois (Old French Arteis Artois + -ien -ian), after the wells of this kind in the region

subartesian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1830, from Fr. puits artésien "wells of Artois," French province where such wells were first bored 18c. by Bélidor (1698-1761), from O.Fr. Arteis, from Atrebates, a tribe who lived in northwestern Gallia. Cf. Arras.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Two-thirds of the world capacity is processing seawater, and one-third uses
  brackish artesian water.
Water confined in this way is said to be under artesian pressure, and the
  aquifer is called an artesian aquifer.
Data indicate that there are two aquifers--a shallow aquifer and an artesian
  aquifer--separated by a clay-and-silt layer.
When a well is drilled into an artesian aquifer, pressure pushes water in the
  well above the top of the aquifer.
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