Source : Webster's Revised Unabridged Dictionary (1913)

Ichnography \Ich*nog"ra*phy\, n. [Gr. ?; ? track, footstep + ?
   to describe: cf. F. ichonographie.] (Drawing)
   A horizontal section of a building or other object, showing
   its true dimensions according to a geometric scale; a ground
   plan; a map; also, the art of making such plans.