any of various small chiefly tropical and usually nocturnal insectivorous terrestrial lizards typically with immovable eyelids; completely harmless
"I gently picked up the tiny gecko from my window sill, relieved that it was just a harmless lizard rather than some dangerous creature."
Any lizard of the family Gekkonidae. They are small, carnivorous, mostly nocturnal animals with large eyes and adhesive toes enabling them to climb on vertical and upside-down surfaces.
"The gecko silently scurried across the ceiling during the night hunt for insects."
To move in the manner of a gecko; to attach to a vertical or upside-down surface.
"After climbing onto the ceiling fan, she realized her hands were sticking to the blade because she had forgotten how hard it is to stop moving like a gecko once you start crawling upward."