thumb|The blue parabola is the involute of the red curve. The red curve is the evolute of the blue parabola, and can be constructed as the locus of all centers of curvature of the blue parabola. right|thumb|The evolute of a curve (in this case, an ellipse) is the envelope of its normals.
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Article · 中文
漸屈線是曲線微分幾何中的概念，它是曲線上圓心的軌跡。等價的描述是一條曲線的漸屈線即是其法線的包絡。 漸屈線與漸伸線是一對相對的概念，若曲線A是曲線B的漸屈線，曲線B即為曲線A的漸伸線。每條曲線的漸屈線唯一確定，但卻可以有無窮多條漸伸線。
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