involute

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involute

1. Botany (esp of petals, leaves, etc., in bud) having margins that are rolled inwards
2. (of certain shells) closely coiled so that the axis is obscured
3. Geometry the curve described by the free end of a thread as it is wound around another curve, the evolute, such that its normals are tangential to the evolute

involute

[¦in·və¦lüt]
(biology)
Being coiled, curled, or rolled in at the edge.
(mathematics)
A curve produced by any point of a perfectly flexible inextensible thread that is kept taut as it is wound upon or unwound from another curve.
A curve that lies on the tangent surface of a given space curve and is orthogonal to the tangents to the given curve.
A surface for which a given surface is one of the two surfaces of center.

involute

1. A curve traced by a point at the end of a string as the string is unwound from a stationary cylinder.
2. Curved spirally.