circle of curvature

circle of curvature

noun Mathematics.
the circle with its center on the normal to the concave side of a curve at a given point on the curve and with its radius equal to the radius of curvature at the point.
Also called osculating circle.
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WordNet
circle of curvature

noun
the circle that touches a curve (on the concave side) and whose radius is the radius of curvature 
WordNet® 3.0, © 2006 by Princeton University.
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