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From: WordNet (r) 2.0

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