mean evolute

mean evolute

[¦mēn ′ev·ə‚lüt]
(mathematics)
The envelope of the planes that are orthogonal to the normals of a given surface and cut the normals halfway between the centers of principal curvature of the surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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