reptilian

[rep-til-ee-uhn, -til-yuhn]
adjective
1.
belonging or pertaining to the Reptilia.
2.
groveling, debased, or despicable; contemptible.
3.
mean; treacherous; harmful.
noun
4.
a reptile.

Origin:
1840–50; < Neo-Latin Reptili(a) reptiles (plural of rēptile, neuter of Late Latin rēptilis; see reptile) + -an

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Collins
World English Dictionary
reptilian (rɛpˈtɪlɪən)
 
adj
1.  of, relating to, resembling, or characteristic of reptiles
2.  mean or treacherous; contemptible: reptilian behaviour
 
n
3.  a less common name for reptile

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
reptilian   (rěp-tĭl'ē-ən)  Pronunciation Key 
Relating to or characteristic of reptiles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Dimetrodon, despite its reptilian appearance, was not a dinosaur.
Some ammonite fossils have tooth marks that look as though they were made by
  huge reptilian predators called mosasaurs.
But it has been a mystery how this delicate system evolved from the cruder
  listening organs of our reptilian ancestors.
The study challenges the old notion that dinosaurs out-competed their reptilian
  contemporaries.
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