pachyderm /ˈpakɪdəːm
/ ▸ noun a very large mammal with thick skin, especially an elephant, rhinoceros, or hippopotamus. – DERIVATIVES pachydermatous /ˌpakɪˈdəːmətəs
/ adjective – ORIGIN mid 19th century: from French pachyderme, from Greek pakhudermos, from pakhus ‘thick’ + derma ‘skin’.