Webster's English Dictionary

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curvature

cur.va.ture \'k*r-v*-.chu.(*)r, -ch*r, -.t(y)u.(*)r\ n 1: the act of 
   curving : the state of being curved  2: a measure or amount of curving; 
   specif : the rate of change of t he angle through which the tangent to a 
   curve turns in moving along the curve 3a: an abnormal curving  3b: a curved 
   surface of an organ