any reptile of the order Crocodylia, comprising the true crocodiles and the alligators, caimans, and gavials.
of, like, or pertaining to a crocodile.
hypocritical; insincere.

1625–35; crocodile + -ian Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crocodilian (ˌkrɒkəˈdɪlɪən)
1.  any large predatory reptile of the order Crocodilia, which includes the crocodiles, alligators, and caymans. They live in or near water and have a long broad snout, powerful jaws, a four-chambered heart, and socketed teeth
2.  of, relating to, or belonging to the Crocodilia
3.  of, relating to, or resembling a crocodile

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
crocodilian   (krŏk'ə-dĭl'ē-ən)  Pronunciation Key 
Any of various semiaquatic reptiles of the order Crocodilia, including the alligators, crocodiles, caimans, and gavials. Crocodilians are squat, massive, and lizardlike, with long, powerful jaws, long, heavy tails, short legs, and thick, plated skin. Like dinosaurs, crocodilians are archosaurs, and their closest modern relatives are the birds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
On examining these marks more closely, they found a crocodilian tooth stuck in
  one of them.
Though decidedly crocodilian in appearance, this primitive land-walker likely
  sported a big back fin instead of a tail.
Another feature of the eyes has contributed to the near-extinction of the
  species: crocodilian eyes reflect light.
His past research has involved crocodilian research and management, wildlife
  monitoring and population modeling.
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