Source : Webster's Revised Unabridged Dictionary (1913)

Hydrographic \Hy`dro*graph"ic\, Hydrographical
\Hy`dro*graph"ic*al\, a.
   Of or relating to hydrography.

Source : WordNet®

hydrographic
     adj : of or relating to the science of hydrography [syn: {hydrographical}]