Main Entry: lab·y·rin·tho·dont

Pronunciation: \-ˈrin(t)-thə-ˌdänt\

Function: noun

Etymology: New Latin Labyrinthodontia, from Greek labyrinthos + odont-, odous tooth — more at tooth

Date: circa 1852

: 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

— labyrinthodont adjective