Is Pachydermatous a Word?

What is Pachydermatous?

1 : of or relating to the pachyderms. 2a : thick, thickened pachydermatous skin. b : callous, insensitive.

Why are elephants called pachyderms?

It's from pachys, meaning "thick," and derma, meaning "skin." In the late 1700s the French naturalist Georges Cuvier adapted the Greek term as pachyderme and used it for any one of a whole assemblage of hoofed animals having thickish skin: elephants, hippopotamuses, rhinoceroses, tapirs, horses, pigs, and more.