Normal

Nor"mal

(nr"ml), n. [Cf. F. normale, ligne normale. See Normal, a.] 1. (Geom.) Any perpendicular.
[1913 Webster]

2. (Geom.) A straight line or plane drawn from any point of a curve or surface so as to be perpendicular to the curve or surface at that point.
[1913 Webster]

The term normal is also used to denote the distance along the normal line from the curve to the axis of abscissas or to the center of curvature.
[1913 Webster]

 

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Mon 10th December 2018