PachydermataPach`y*der"ma*ta\, n. pl. [NL., fr. Gr. ? thick-skinned; pachy`s thick + ? skin.] (Zo["o]l.) 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.
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