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Webster's 1913 Dictionary

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.