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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Circle of curvature is always a great word to know.
So is cube. Does it mean:
the process of replacing a number by another number of approximately the same value but having fewer digits
the third power of a quantity such as a cubed = a?a?a
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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