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 for Curvature of the spine
From The Collaborative International Dictionary of English v.0.48 :

  Curvature \Cur"va*ture\ (k?r"v?-t?r; 135), n. [L. curvatura. See
     1. The act of curving, or the state of being bent or curved;
        a curving or bending, normal or abnormal, as of a line or
        surface from a rectilinear direction; a bend; a curve.
        [1913 Webster]
              The elegant curvature of their fronds. --Darwin.
        [1913 Webster]
     2. (Math.) The amount of degree of bending of a mathematical
        curve, or the tendency at any point to depart from a
        tangent drawn to the curve at that point.
        [1913 Webster]
     Aberrancy of curvature (Geom.), the deviation of a curve
        from a circular form.
     Absolute curvature. See under Absolute.
     Angle of curvature (Geom.), one that expresses the amount
        of curvature of a curve.
     Chord of curvature. See under Chord.
     Circle of curvature. See Osculating circle of a curve,
        under Circle.
     Curvature of the spine (Med.), an abnormal curving of the
        spine, especially in a lateral direction.
     Radius of curvature, the radius of the circle of curvature,
        or osculatory circle, at any point of a curve.
        [1913 Webster]

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