Intrinsic equation of a curve
|(Geom.)||the equation which expresses the relation which the length of a curve, measured from a given point of it, to a movable point, has to the angle which the tangent to the curve at the movable point makes with a fixed line.|
See also: Intrinsic
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.