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]