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reptilian (adj.)

"of, resembling, or characteristic of reptiles," 1835, from reptile + -ian. Transferred meaning "malignant, cold, underhanded" is by 1859.

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Definitions of reptilian from WordNet
1
reptilian (n.)
any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms;
Synonyms: reptile
2
reptilian (adj.)
of or relating to the class Reptilia;
From wordnet.princeton.edu