Cartesian /(?)/

Car·te·sian

Cartesian

a.
  1. Of or pertaining to the French philosopher René Descartes, or his philosophy.
    The Cartesion argument for reality of matter.

Phrases & Compounds
Cartesian coordinates
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
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

n.
  1. An adherent of Descartes.