indicatrix

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  1. In geometry, the curve of intersection of any surface with a plane indefinitely near and parallel to the tangent-plane at any point. The indicatrix is a hyperbola, a pair of parallel lines, or an ellipse, according as the surface is anticlastic, cylindrical, or synclastic, at the point of tangency.
  2. In the theory of equations, a curve which exhibits the joint effect of the two middle criteria of Newton's rule, in the case of an equation of the fifth degree having all its roots imaginary.
  3. Spherical indicatrix the spherical curve traced on a unit sphere by the extremity of a radius drawn parallel to the tangent of a tortnous curve.
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  1. New Latin, feminine to indicator.
 

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