WordNet (r) 3.0 (2006):

superorder Labyrinthodontia
    n 1: extinct amphibians typically resembling heavy-bodied
         salamanders or crocodiles and having a solid flattened
         skull and conical teeth; Devonian through Triassic [syn:
         Labyrinthodontia, superorder Labyrinthodontia,
         Labyrinthodonta, superorder Labyrinthodonta]