/ Thesaurus / H Synonyms of hippopotamus amphibius Find synonyms for: Noun1. hippopotamus, hippo, river horse, Hippopotamus amphibius, even-toed ungulate, artiodactyl, artiodactyl mammalusage: massive thick-skinned herbivorous animal living in or around rivers of tropical AfricaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language