pachyderm
noun /ˈpækidɜːm/
/ˈpækidɜːrm/
(specialist)- a type of animal with a very thick skin, for example an elephant
厚皮动物（如大象） 词源mid 19th cent.: from French pachyderme, from Greek pakhudermos, from pakhus ‘thick’ + derma ‘skin’.