Definitions for "Hallux"
Keywords:  toe, hind, backward, hallex, hallucis
backward-facing toe
The toe which faces backwards in raptors. In hawks, this is the talon most responsible for puncturing the vitals of prey.
Latin hallex = great toe (hallucis = of the great toe).
A hallux, or dewclaw, is a functionless claw that doesn't hit the ground. Some dinosaurs had dewclaws.