| NOUN | attribute | circle of curvature, osculating circle | the circle that touches a curve (on the concave side) and whose radius is the radius of curvature |
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| Meaning | The circle that touches a curve (on the concave side) and whose radius is the radius of curvature. | |
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| Synonym | osculating circle | |
| Broader | circle | ellipse in which the two axes are of equal length |