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radius
- (math.) The distance from the center of a circle to its circumference, from the center of a sphere to its surface, or from the center of a regular polygon to any one of its vertices. The radius of curvature, r, at any point of a curve is r = 1/κ, where κ is the curvature.
• GEOMETRY - (astron.) An old instrument for measuring the angular distance between two celestial objects.
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