Source : Webster's Revised Unabridged Dictionary (1913)

Wombat \Wom"bat\, n. [From the native name, womback, wombach, in
   Australia.] (Zo["o]l.)
   Any one of three species of Australian burrowing marsupials
   of the genus {Phascolomys}, especially the common species
   ({P. ursinus}). They are nocturnal in their habits, and feed
   mostly on roots.