Jisho

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しんかいせん 伸開線
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Noun
1. involute​Mathematics, Rare term, See also インボリュート
Wikipedia definition
2. Involute​In the differential geometry of curves, an involute (also known as evolvent) is a curve obtained from another given curve by attaching an imaginary taut string to the given curve and tracing its free end as it is wound onto that given curve; or in reverse, unwound. It is a roulette wherein the rolling curve is a straight line containing the generating point. For example, an involute approximates the path followed by a tetherball as the connecting tether is wound around the center pole.
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