hippopotamus
/ˌhɪpəˈpɒtəməs/noun
(pl. hippopotamuses 或 hippopotami /-maɪ/)
1- a large thick-skinned semiaquatic African mammal, with massive jaws and large tusks河马。
1.1
- Family Hippopotamidae: the very large Hippopotamus amphibius, frequenting rivers and lakes, and the smaller pygmy hippopotamus (Choeropsis liberiensis), frequenting forests near fresh water in West Africa.河马科： 分常见于河流和湖泊的大河马和常见于西非淡水边森林的倭河马（拉丁名 Choeropsis liberiensis）。
词源
Middle English: via Latin from Greek hippopotamos, earlier hippos ho potamios 'river horse' （from hippos 'horse', potamos 'river'）.