Webster
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Webster’s Revised Unabridged Dictionary · 1913

Cartesian

Car·te′sian, a. [From Renatus Cartesius, Latinized from of René Descartes: cf. F. cartésien.] Of or pertaining to the French philosopher René Descartes, or his philosophy.

The Cartesion argument for reality of matter. Sir W. Hamilton.

Cartesian coördinates (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.

Car·te′sian, n. An adherent of Descartes.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.