The Collaborative International Dictionary of English v.0.48:

Ideographic \I`de*o*graph"ic\, Ideographical
\I`de*o*graph"ic*al\, a. [Cf. F. id['e]ographique.]
   Of or pertaining to an ideogram; representing ideas by
   symbols, independently of sounds; as, 9 represents not the
   word "nine," but the idea of the number itself. --
   I`de*o*graph"ic*al*ly, adv.
   [1913 Webster]