'Pachydermata' definitions:

Definition of 'Pachydermata'

From: GCIDE

Pachydermata \Pach`y*der"ma*ta\ (p[a^]k`[i^]*d[~e]r"m[.a]*t[.a]), n. pl. [NL., fr. Gr. pachy`dermos thick-skinned; pachy`s thick + de`rma skin.] (Zool.) A group of hoofed mammals distinguished for the thickness of their skins, including the elephant, hippopotamus, rhinoceros, tapir, horse, and hog; the pachyderms. It is now considered an artificial group. [1913 Webster]