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Definition of LABYRINTHODONT
: any of a superorder (Labyrinthodontia) of extinct amphibians of the Late Paleozoic and Early Mesozoic typically having bodies resembling salamanders or crocodiles and considered to be the earliest tetrapod vertebrates
Origin of LABYRINTHODONT
New Latin Labyrinthodontia, from Greek labyrinthos + odont-, odous tooth — more at tooth