Potamophilous is an obsolete nonce word.
Obsolete means it is no longer used and a nonce word is one which was invented and used only once of a few times, never being intended to stick in the language. That's a real shame because I think it is a lovely word. It means river-loving.
It appeared in 1827 in the sentence "Rowed..in his public State barge, on the bosom of the Thames, in all the majesty and magnificence of a Fluviatile and Potamophilous Lord Mayor."
Let's have the word back into use please, after all, Hippopotamuses are potamophilous!
