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1. Oxford Dictionary

   radius of curvature

   • n.
     the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.

   • noun: radius of curvature, plural noun: radii of curvature

2. • 更多解釋

   radius of curvature

   • IPA[ˈrādēəs əv]

   • n.
     the radius of a circle which touches a curve at a given point and has the same tangent and ...

   Oxford American Dictionary