• WordNet 3.6
    • n labyrinthodont an amphibian of the superorder Labyrinthodontia
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Webster's Revised Unabridged Dictionary
    • a Labyrinthodont (Paleon) Of or pertaining to the Labyrinthodonta.
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Century Dictionary and Cyclopedia
    • labyrinthodont Having an intricate or labyrinthic structure, as a tooth.
    • labyrinthodont Having teeth of labyrinthic structure; specifically, pertaining to the Labyrin-thodontia, or having their characters.
    • n labyrinthodont A labyrinthodont animal; a member of the order Labyrinthodontia.
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In literature:

A genus of Labyrinthodont Amphibians.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
He has also written memoirs on Saurians and Labyrinthodonts.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6" by Various
Salamander-like larvae of labyrinthodonts are well known, especially those formerly supposed to comprise the order Branchiosauria.
"The Ancestry of Modern Amphibia: A Review of the Evidence" by Theodore H. Eaton