Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hydrographical is an adjective meaning "of or relating to the science of hydrography". It carries one recorded sense.
of or relating to the science of hydrography
Definitions, synonyms and semantic relations for hydrographical come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.