circle of curvature
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Related to circle of curvature: osculating sphere
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|Noun||1.||circle of curvature - the circle that touches a curve (on the concave side) and whose radius is the radius of curvature|
circle - ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"