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Definition of: evolute
(ev′ə·l
t) noun Math.
A curve which is the locus of the center of curvature of another curve, its involute, and therefore tangent to all its normals; a curve that is the envelope of all the normals of another curve. [<L evolutus, pp. of evolvere. See EVOLVE.]
ABC is the evolute of ellipse ADC. Cord AC, if fastened at A and swung so as to encompass AB, will describe are CD of the ellipse.
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