Jisho

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しゅくへいせん 縮閉線
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Noun
1. evolute​Mathematics, Rare term, See also エボリュート
Wikipedia definition
2. Evolute​In the differential geometry of curves, the evolute of a curve is the locus of all its centers of curvature. Equivalently, it is the envelope of the normals to a curve. The evolute of a curve, a surface, or more generally a submanifold, is the caustic of the normal map. Let M be a smooth, regular submanifold in R. For each point p in M and each vector v, based at p and normal to M, we associate the point p + v. This defines a Lagrangian map, called the normal map.
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