American English

Definition of hippopotamus noun from the Oxford Advanced American Dictionary

 

hippopotamus

 noun
noun
NAmE//ˌhɪpəˈpɑt̮əməs//
 
(pl. hippopotamuses
NAmE//ˌhɪpəˈpɑt̮əməsəz//
 
or hippopotami
NAmE//ˌhɪpəˈpɑt̮əmaɪ//
 
)
(informal hippo)
 
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a large, heavy, African animal with thick dark skin and short legs, that lives in rivers and lakes
See the Oxford Advanced Learner's Dictionary entry: hippopotamus