Definitions

1. noun

A curve, especially the path traced by a point on a line or a curve that is changing.

“The evolvent of the parabola was used to design the new bridge.”

2. noun

A curve or surface that is the locus of points for which the ratio of the distances from two fixed points is constant.

“The evolvent of the ellipse was an essential component in the construction of the new astronomical instrument.”

3. noun

In printing, a curved or curved-toothed wheel used to raise or lower the type in a composing stick.

“The typesetter carefully adjusted the evolvent to ensure the proper alignment of the type.”