hip ‧ po ‧ pot ‧ a ‧ mus /ˌhɪpəˈpɒtəməs $ -ˈpɑː-/ BrE AmE noun ( plural hippopotamuses or hippopotami /-maɪ-/) [countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: Greek , from hippos 'horse' + potamos 'river' ]
a large grey African animal with a big head and mouth that lives near water ⇨ rhinoceros