catflap.org Online Dictionary Query

  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.