The Collaborative International Dictionary
Hydrographical
Hydrographic \Hy`dro*graph"ic\, Hydrographical \Hy`dro*graph"ic*al\, a. Of or relating to hydrography.
Wiktionary
hydrographical
a. hydrographic
WordNet
hydrographical
adj. of or relating to the science of hydrography [syn: hydrographic]
Usage examples of "hydrographical".
Webster saw her in young Seppings' yard where they were fitting her out regardless, diagonal bracing and everything you can think of - fitting her out for a hydrographical voyage.