Category:Pachydermata

Pach`y*der"ma*ta, n. pl. [nl., fr. Gr. thick-skinned; pachy`s thick +  skin.] (zoöl.)

Defn: a group of hoofed mammals distinguished for the thickness of Their skins, including the elephant, hippopotamus, rhinoceros, tapir, Horse, and hog. It is now considered an artificial group.