Gecko n. : Any lizard of the family Geckonidae. The geckoes are small, carnivorous, mostly nocturnal animals with large eyes and vertical, elliptical pupils. Their toes are generally expanded, and furnished with adhesive disks, by which they can run over walls and ceilings. They are numerous in warm countries, and a few species are found in Europe and the United States. See Wall gecko, Fanfoot.

Example:
What is the difference between a Gecko and an anole? What is the lifespan of each?

Taxonomy
gecko, species, subfamily, toes, day geckos, nocturnal geckos, Flying Geckos, lizards, surfaces, synthetic setae, genus Phelsuma, free encyclopedia, family Gekkonidae, gecko species, toe pads, climb, islands, spatula.

Defination from the web:
Gecko) become part of the indoor menagerie and are often welcome guests, as they feed on insects, including mosquitoes. The largest species, Delcourt's gecko, is only known from a single, stuffed specimen found in the basement of a museum in Marseille, ...