Webster's Revised Unabridged Dictionary · 1913

Cartesian

Cartesian , adjective

[From Renatus Cartesius, Latinized from of René Descartes: compare French cartésien.]

Of or pertaining to the French philosopher René Descartes, or his philosophy.
The Cartesion argument for reality of matter. — Sir W. Hamilton
Collocations (3)
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 (Geometry) , 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.

Cartesian , noun

An adherent of Descartes.