cartesian

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

"ordinates">Cartesian co"ordinates (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]

Cartesian Car*te"sian, n. An adherent of Descartes.
[1913 Webster]

Source: The Collaborative International Dictionary of English