LABYRINTHODONTA

Labyrinthodonta, superorder Labyrinthodontia, Labyrinthodontia, superorder Labyrinthodonta

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

Source: WordNet® 3.1

Lab`y*rin`tho*don"ta, n. pl. Etym: [NL. See Labyrinthodon.] (Paleon.)

Definition: An extinct order of Amphibia, including the typical genus Labyrinthodon, and many other allied forms, from the Carboniferous, Permian, and Triassic formations. By recent writers they are divided into two or more orders. See Stegocephala.

Source: Webster’s Unabridged Dictionary 1913 Edition