คำว่า ' hydrography ' ( N )
มีความหมายในภาษาไทยว่า อุทกศาสตร์
คำนิยามในภาษาอังกฤษ (definition) :
[n.] The art of measuring and describing the sea, lakes, rivers, and other waters, with their phenomena.
[n.] 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.