Source : Webster's Revised Unabridged Dictionary (1913)

Pachyderm \Pach"y*derm\, n. [Cf. F. pachyderme.] (Zo["o]l.)
   One of the Pachydermata.

Source : WordNet®

pachyderm
     n : any of various nonruminant hoofed mammals having very thick
         skin: elephant; rhinoceros; hippopotamus