1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Pachydermata  \Pach`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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