
Pachydermata (from two Greek words παχύς pachys, `thick` and δερμα derma, `skin`, meaning `thick skin`) is an obsolete order of mammals described by Gottlieb Storr, Georges Cuvier and others, at one time recognized by many systematists. Because it is polyphyletic, the order is no longer in use, but it is important in the history of...
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http://en.wikipedia.org/wiki/Pachydermata

• (n. pl.) 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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http://thinkexist.com/dictionary/meaning/pachydermata/
Pach`y·der'ma·ta noun plural [ New Latin , from Greek ... thick-skinned;
pachy`s thick + ... skin.]
(Zoology) 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 a...
Found on
http://www.encyclo.co.uk/webster/P/1

Pachydermata was a classification for hoofed mammals distinguished by the thickness of their skins, and including the elephant, hippopotamus, rhinoceros, tapir, horse, and hog. The classification is now no longer used, as the group is recognised as artificial.
Found on
http://www.probertencyclopaedia.com/browse/BP.HTM
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