1. (noun)Hippo, Hippo Regius an ancient Numidian town in northwestern Africa adjoining present-day Annaba in northeastern Algeria Synonyms: riverhorse, hippopotamus
2. (noun)hippopotamus, hippo, river horse, Hippopotamus amphibius massive thick-skinned herbivorous animal living in or around rivers of tropical Africa Synonyms: riverhorse, hippo, hippopotamus