Большой англо-русский словарь (с транскрипциями)
[ˌhɪpəˈpɔtəməs] сущ. гиппопотам
(зоология) гиппопотам (Hippopotamus amphibius)
Merriam-Webster's Collegiate® Dictionary, 11th Edition
noun (plural -muses or hippopotami)
Etymology: Latin, from Greek hippopotamos, alteration of hippos potamios, literally, riverine horse
Date: 1563
a very large herbivorous 4-toed chiefly aquatic artiodactyl mammal ( Hippopotamus amphibius ) of sub-Saharan Africa with an extremely large head and mouth, bare and very thick grayish skin, and short legs