a. [ F. artésien, fr. Artois in France, where many such wells have been made since the middle of the last century. ] Of or pertaining to Artois (anciently called Artesium), in France. [ 1913 Webster ]

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. [ 1913 Webster ]

a. [ From Renatus Cartesius, Latinized from of René Descartes: cf. F. cartésien. ] Of or pertaining to the French philosopher René Descartes, or his philosophy. [ 1913 Webster ]

The Cartesion argument for reality of matter. Sir W. Hamilton. [ 1913 Webster ]

Cartesian coordinates (Geom), distance of a point from lines or planes; -- used in a system of representing geometric quantities, invented by Descartes. --
Cartesian devil, a small hollow glass figure, used in connection with a jar of water having an elastic top, to illustrate the effect of the compression or expansion of air in changing the specific gravity of bodies. --
Cartesion oval (Geom.), a curve such that, for any point of the curve mr + m′r′ = c, where r and r′ are the distances of the point from the two foci and m, m′ and c are constant; -- used by Descartes. [ 1913 Webster ]

n. An adherent of Descartes. [ 1913 Webster ]

n. The philosophy of Descartes. [ 1913 Webster ]