[rep-til, -tahyl]
any cold-blooded vertebrate of the class Reptilia, comprising the turtles, snakes, lizards, crocodilians, amphisbaenians, tuatara, and various extinct members including the dinosaurs.
(loosely) any of various animals that crawl or creep.
a groveling, mean, or despicable person.
of or resembling a reptile; creeping or crawling.
groveling, mean, or despicable.

1350–1400; Middle English reptil < Late Latin rēptile, noun use of neuter of rēptilis creeping, equivalent to Latin rēpt(us) (past participle of rēpere to creep) + -ilis -ile

reptilelike, adjective
reptiloid [rep-tl-oid] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reptile (ˈrɛptaɪl)
1.  any of the cold-blooded vertebrates constituting the class Reptilia, characterized by lungs, an outer covering of horny scales or plates, and young produced in amniotic eggs. The class today includes the tortoises, turtles, snakes, lizards, and crocodiles; in Mesozoic times it was the dominant group, containing the dinosaurs and related forms
2.  a grovelling insignificant person: you miserable little reptile!
3.  creeping, crawling, or squirming
4.  grovelling or insignificant; mean; contemptible
[C14: from Late Latin reptilis creeping, from Latin rēpere to crawl]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1390, from O.Fr. reptile (1314), from L.L. reptile, neut. of reptilis (adj.) "creping, crawling," from rept-(um), pp. stem of repere "to crawl, creep," from PIE base *rep- "to creep, crawl" (cf. Lith. replioju "to creep"). Used of persons of low character from 1749.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
reptile   (rěp'tīl')  Pronunciation Key 
Any of various cold-blooded vertebrates of the class Reptilia, having skin covered with scales or horny plates, breathing air with lungs, and usually having a three-chambered heart. Unlike amphibians, whose eggs are fertilized outside the female body, reptiles reproduce by eggs that are fertilized inside the female. Though once varied, widespread, and numerous, reptilian lineages, including the pterosaurs, ichthyosaurs, plesiosaurs, and dinosaurs, have mostly become extinct (though birds are living descendants of dinosaurs). The earliest reptiles were the cotylosaurs (or stem reptiles) of the late Mississippian or early Pennsylvanian Period, from which mammals evolved. Modern reptiles include crocodiles, snakes, turtles, and lizards.
The American Heritage® Science Dictionary
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