Tried to get wise about halux. But they had only this:
hal·lux (hlks) KEY

NOUN:
pl. hal·lu·ces (hly-sz, hl-) KEY
The innermost or first digit on the hind foot of certain mammals. The human hallux is commonly called the big toe.
A homologous digit of a bird, reptile, or amphibian. In birds, it is often directed backward.