-- Define the terms of principal axis
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each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.
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principal axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly" optic axis. axis - a straight line through a body or figure that satisfies certain
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