Source : Webster's Revised Unabridged Dictionary (1913)

Orthographic \Or`tho*graph"ic\, Orthographical
\Or`tho*graph"ic*al\, a. [Cf. F. orthographique, L.
   orthographus, Gr. ?.]
   1. Of or pertaining to orthography, or right spelling; also,
      correct in spelling; as, orthographical rules; the letter
      was orthographic.

   2. (Geom.) Of or pertaining to right lines or angles.

   {Orthographic or Orthogonal}, {projection}, that projection
      which is made by drawing lines, from every point to be
      projected, perpendicular to the plane of projection. Such
      a projection of the sphere represents its circles as seen
      in perspective by an eye supposed to be placed at an
      infinite distance, the plane of projection passing through
      the center of the sphere perpendicularly to the line of
      sight.