hippŏpŏtămus, i, m., = ἱπποπόταμος,
a river - horse , hippopotamus , Plin. 8, 25, 39, § 95; Mel. 1, 9, 3; Amm. 22, 15.
·noun A large, amphibious, herbivorous mammal (Hippopotamus amphibius), common in the rivers of Afri...
Webster's Dictionary of the English Language