principal radii

principal radii

[′prin·sə·pəl ′rād·ē‚ī]
(mathematics)
The radii of curvature of the normal sections with maximum and minimum curvature at a given point on a surface; the reciprocals of the principal curvatures.
References in periodicals archive ?
where [r.sub.ix], [r.sub.iy] are principal radii of the curvature of body 1 in xz plane and yz plane, respectively.
[r.sub.1x]: Principal radii of curvature of body 1 in xz plane
[r.sub.2x]: Principal radii of curvature of body 2 in xz plane
[r.sub.1y]: Principal radii of curvature of body 12 in yz plane

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