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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
[1913 Webster]

2. (Geom.) Of or pertaining to right lines or angles.
[1913 Webster]

{Orthographic projection} 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.
[1913 Webster]

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