The Collaborative International Dictionary of English v.0.48:

Orthomorphic \Or`tho*mor"phic\, a. [Ortho- + morphic.] (Geom.)
   Having the right form.
   [1913 Webster]

   Orthomorphic projection, a projection in which the angles
      in the figure to be projected are equal to the
      corresponding angles in the projected figure.
      [1913 Webster] orthopaedic

WordNet (r) 3.0 (2006):

orthomorphic projection
    n 1: a map projection in which a small area is rendered in its
         true shape [syn: conformal projection, orthomorphic
         projection]