prin'cipal ax'is

1. Optics.a line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.
2. of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

principal argumentprincipal clause
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