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principal axises

 - 2 dictionary results

principal axis

–noun
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. Physics. one of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum.

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: prin·ci·pal axis
Pronunciation: 'prin(t)-s&-p&l-
Function: noun
: the line with respect to which a spherical mirror or lenssystem is symmetrical and which passes through both the center of the surfaces and their centers of curvature
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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