pachy·derm /ˈpækɪˌdɚ/
  厚皮類動物,遲鈍的人
  pach·y·derm n.  Zool. Any of various nonruminant hoofed mammals having very thick skin, including the elephant, rhinoceros, and hippopotamus, one of the Pachydermata.
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  pachyderm
       n : any of various nonruminant hoofed mammals having very thick
           skin: elephant; rhinoceros; hippopotamus