The Collaborative International Dictionary of English v.0.48:

Cynodontia \Cynodontia\ n.
   a division of Triassic Therapsida comprising small
   carnivorous reptiles often with mammallike teeth.

   Syn: division Cynodontia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cynodontia
    n 1: a division of the order Therapsida from the Triassic period
         comprising small carnivorous tetrapod reptiles often with
         mammal-like teeth [syn: Cynodontia, division
         Cynodontia]