Term: pachyderm or pachiderm (pl pachydermata)
Literally meaning: “thick skin”
Origin: Anc Greek
+δέρμα/derma(=skin) > δεσμά/desma(=bonds) because skin keeps the body tight > δέρω/dero(=to peel, to flay).
In 1797 by French zoologist George Leopole Chretien Frederic Dagobert Cuvier (1769-1832)
Pachyderma is an obsolete order of thick-skinned , hoofed mammals such as the elephants, rhinoceroses, mammoths, hippopotami and pigs.