Webster's English Dictionary

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reptile

1. rep.tile \'rep-t*l, -.ti-l\ n [ME reptil, fr. MF or LL; MF reptile 
   (fem.), fr. LL reptile (]neut.), fr. neut. of reptilis reptant, fr. L 
   reptus, pp. of repere to creep; akin to OHG reba tendril 1: an animal that 
   crawls or moves (as a snake) on its belly or (as a lizard ) on small short 
   legs 2a: any of a class (Reptilia) of air-breating vertebrates including 
   the all igators and crocodiles, lizards, snakes, turtles, and extinct 
   related forms with a completely ossified skeleton including a single 
   occipital condyle, a distinct quadrate bone usu. immovably articulated with 
   the skull, ribs attached to the sternum, and a body usu. covered with 
   scales or bony plates 2b: AMPHIBIAN  3: a groveling or despicable person 
2. reptile aj : characteristic of a reptile : REPTILIAN