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labyrinthodont

[lab-uh-rin-thuh-dont] /ˌlæb əˈrɪn θəˌdɒnt/
noun
1.
any member of several orders of small to large lizardlike terrestrial and freshwater amphibians, some ancestral to land vertebrates, forming the extinct subclass Labyrinthodonta that flourished from the Devonian through the Triassic periods, characterized by a solid, flattened skull and conical teeth.
adjective
2.
having teeth with complexly infolded enamel surfaces.
3.
belonging to or pertaining to the Labyrinthodonta.
Origin
1840-1850
1840-50; < Neo-Latin Labyrinthodonta, equivalent to Greek labýrinth(os) labyrinth + -odonta, neuter plural of -odontos -odont
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for labyrinthodont

labyrinthodont

/ˌlæbəˈrɪnθəˌdɒnt/
noun
1.
any primitive amphibian of the order Labyrinthodontia, of late Devonian to Triassic times, having teeth with much-folded dentine
Word Origin
C19: from Greek laburinthoslabyrinth + -odont
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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labyrinthodont in Science
labyrinthodont
  (lāb'ə-rĭn'thə-dŏnt')   
Any of various extinct amphibians of the group Labyrinthodontia, which were the dominant animals of the late Paleozoic Era. Labyrinthodonts had stocky, lizardlike bodies with short limbs, and fishlike teeth with labyrinthine structure (with complex infolding of the enamel). They varied from the size of a salamander to that of a crocodile. One early genus, Ichthyostega, was probably the first terrestrial vertebrate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for labyrinthodont

a type of tooth made up of infolded enamel that provides a grooved and strongly reinforced structure. This tooth type was common in the true amphibians of the Paleozoic Era, some lobe-finned fishes closely related to tetrapods, and in the early anthracosaurs-which were tetrapods closely related to the amniotes.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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