[1] : The Collaborative International Dictionary of English v.0.48

cartesian \carte"sian\, a. from renatus cartesius, latinized
   from of ren'e descartes: cf. f. cart'esien.
   of or pertaining to the french philosopher ren'e 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
see also:
cartesian coordinates cartesian devil cartesion oval 

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Oval, definition of term: Oval
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