Wordnet 3.0
NOUN (1)
1.
the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation;
The Collaborative International Dictionary of English v.0.48:
Hydrography \Hy*drog"ra*phy\, n. [Hydro-, 1 + -graphy: cf. F.
hydrographie.]
1. The art of measuring and describing the sea, lakes,
rivers, and other waters, with their phenomena.
[1913 Webster]
2. That branch of surveying which embraces the determination
of the contour of the bottom of a harbor or other sheet of
water, the depth of soundings, the position of channels
and shoals, with the construction of charts exhibiting
these particulars.
[1913 Webster]
WordNet (r) 3.0 (2006):
hydrography
n 1: the science of the measurement and description and mapping
of the surface waters of the earth with special reference
to navigation