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The Collaborative International Dictionary
Potamology

Potamology \Pot`a*mol"o*gy\, n. [Gr. ? river + -logy.] A scientific account or discussion of rivers; a treatise on rivers; potamography.

Douglas Harper's Etymology Dictionary
potamology

"the study of rivers," 1829, from potamo- + -logy.

Wiktionary
potamology

n. (context geography English) The study of rivers