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labrum
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labyrinthodont

lab·y·rin·tho·dont [ làbbə rínthə dònt ] (plural lab·y·rin·tho·donts)


noun 
Definition:
 
extinct amphibian: an extinct amphibian resembling the crocodile that lived in the Late Paleozoic and Early Mesozoic eras. Order Labyrinthodontia.

[Mid-19th century. < modern Latin Labyrinthodontia, literally "labyrinth-toothed" < Greek laburinthos "labyrinth"]
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