curvature

Noun
  1. (medicine) a curving or bending;
    Often abnormal (synset 114236810)
    "curvature of the spine"
  2. The rate of change (at a point) of the angle between a curve and a tangent to the curve (synset 105109697)
  3. The property possessed by the curving of a line or surface (synset 105079832)

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