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cir'cle of cur'vature



Math.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

circle of convergencecircle of least confusion
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