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From The Collaborative International Dictionary of English v.0.48:
Wombat \Wom"bat\, n. [From the native name, womback, wombach, in Australia.] (Zool.) Any one of three species of Australian burrowing marsupials of the genus Phascolomys, especially the common species (Phascolomys ursinus). They are nocturnal in their habits, and feed mostly on roots. [1913 Webster]