The Collaborative International Dictionary of English v.0.48:

Toxodonta \Tox`o*don"ta\, n.pl. [NL.] (Paleon.)
   An extinct order of Mammalia found in the South American
   Tertiary formation. The incisor teeth were long and curved
   and provided with a persistent pulp. They are supposed to be
   related both to the rodents and ungulates. Called also
   Toxodontia.
   [1913 Webster]