curvature
noun
cur·va·ture
ˈkər-və-ˌchu̇r
-chər,
-ˌtyu̇r,
-ˌtu̇r
2
: a measure or amount of curving
specifically
: the rate of change of the angle through which the tangent to a curve turns in moving along the curve and which for a circle is equal to the reciprocal of the radius
3
a
: an abnormal curving (as of the spine)
b
: a curved surface of an organ
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Merriam-Webster unabridged
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