Reptile (noun)

1. A cold-blooded vertebrate of a class that includes snakes, lizards, crocodiles, turtles, and tortoises.
2. Something that is perceived as cold-blooded and sly.

Origin:

Late middle english: from old french reptil or latin reptilis, from reptare "crawl".

Examples:

1. The zoo has a wide variety of reptiles.
2. Reptiles are ectothermic animals.
3. He had a fascination with reptiles.
4. The reptile exhibit is popular with visitors.
5. She was described as a reptile for her cold-hearted behavior.