any of the thick-skinned, nonruminant ungulates, as the elephant, hippopotamus, and rhinoceros.
a person who is not sensitive to criticism, ridicule, etc.; a thick-skinned person.
Origin of pachyderm
1830–40; < New LatinPachyderma, assumed singular of Pachydermata (plural) obsolete order name < Greekpachý(s) thick + -dérmata, neuter plural of -dermatos -skinned, adj. derivative of dermat-, stem of dérma skin, derma1
Related formspach·y·der·mal, pach·y·der·mous, pach·y·der·mic, pach·y·der·moid, adjective
1838, from French pachyderme (c.1600), adopted as a biological term 1797 by French naturalist Georges Léopole Chrétien Frédéric Dagobert, Baron Cuvier (1769-1832), from Greek pachydermos "thick-skinned," from pachys "thick, large, massive," from PIE *bhengh- "thick, fat" (cf. Sanskrit bahu- "much, numerous" Avestan bazah- "height, depth," Hittite pankush "large," Old Norse bingr "heap," Old High German bungo "a bulb," Lithuanian biess "thick") + derma "skin" (see derma).