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In geom., a curve by means of which right lines equal to the circumferences of circles or other curves, and their various parts, may be found mechanically.

About 420 B. C. Hippias of Elis invented a certain curve called the quadratrix by means of which he could square the circle and trisect any angle. "The Teaching of Geometry" – David Eugene Smith

About 420 B. C. Hippias of Elis invented a certain curve called the quadratrix by means of which he could square the circle and trisect any angle.

A doubling of a cord through which another may pass: an ornamental doubling in fringes. ...