Meaning of HYDROGRAPHY in English
— hydrographer , n. — hydrographic /huy'dreuh graf"ik/ , hydrographical , adj. — hydrographically , adv.
/huy drog"reuh fee/ , n.
1. the science of the measurement, description, and mapping of the surface waters of the earth, with special reference to their use for navigation.
2. those parts of a map, collectively, that represent surface waters.
[ 1550-60; HYDRO- 1 + -GRAPHY ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012