Definition of "hexapod"

My lips will be even more firmly sealed about the various suggestions put forward concerning the interpersonal relationships of Alpha Centauri, the hermaphrodite hexapod.

1983, Jean-Marc Lofficier, The Doctor Who Programme Guide, volume 2, page 8

The bizarre hexapods did indeed feed upon those unfortunate creatures who had been caught and killed by the flames. But the striped carnivores were not scavengers; They were hunters.

2000, Alan Dean Foster, A Triumph of Souls

These concepts are applied to a robotic hexapod, which, through the use of compliant microspines on its feet, is capable of climbing hard vertical textured surfaces, such as stucco

2007, Gaurav Suhas Sukhatme, Stefan Schaal, Wolfram Burgard, editors, Robotics: Science and Systems II, page 97