labyrinthodontia

from The Century Dictionary.

• In Owen's classification, the thirteenth order of the fourth subclass of Hæmatocrya, named from the genus Labyrinthodon, containing fossil amphibians having “teeth rendered complex by undulation and side branches of the converging folds of enamel, whence the name.”

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun extinct amphibians typically resembling heavy-bodied salamanders or crocodiles and having a solid flattened skull and conical teeth; Devonian through Triassic