potamology (n.)

"the study of rivers," 1829, in "POTAMOLOGY : a Tabular Description of the Principal Rivers throughout the World,—their Rise, Course, Cities, &c., Tributary Streams, Length and Outfall into Oceans, Seas, or Lakes," compiled and printed by George Smallfield, from potamo- + -logy. Related: Potamological.

POTAMOLOGY—what is that? Why the science of Rivers, to be sure ; and a very good science it is ; and a very good word it is, to designate that science, coined out of sterling Greek, its two etymons flowing harmoniously together into a continued stream of sound, and well deserving to become a current expression. [The Monthly Repository and Review, January, 1829]