Ar·te·sian a. Of or pertaining to Artois (anciently called Artesium), in France.
Artesian wells, 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.
adj : (of water) rising to the surface under internal hydrostatic
pressure; "an artesian well"; "artesian pressure" [syn:
flowing] [ant: subartesian]