1. Someone or something having thick skin, for example, elephant, hippopotamus, and rhinoceros.
2. An insensitive person.
3. A person who is not affected by criticism or ridicule.

ETYMOLOGY: From French pachyderme, from Greek pakhudermos (thick-skinned), from pakhus (thick) + derma (skin). Ultimately from the Indo-European root der- (to split, peel, or flay), which also gave us tear, tart, turd, and Hindi dalit (oppressed, crushed). Earliest documented use: 1828.

PACHYPERM - treatment to make your hair simultaneously thick and curly

PEACHYDERM - skin like Scarlett O'Hara's (antebellum, anyway)

PATCHYDERM - the Heartbreak of Psoriasis