Meaning of evolute

ev•o•lute

Pronunciation: (ev'u-lt" or, esp. Brit., ē'vu-), [key]
— n. Geom.
  1. the locus of the centers of curvature of, or the envelope of the normals to, another curve. Cf. involute (def. 5).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.