The Collaborative International Dictionary of English v.0.48:
Hydrographic \Hy`dro*graph"ic\, Hydrographical \Hy`dro*graph"ic*al\, a. Of or relating to hydrography. [1913 Webster]WordNet (r) 3.0 (2006):
hydrographic adj 1: of or relating to the science of hydrography [syn: hydrographic, hydrographical]