/hal"euhks/ , n. , pl. halluces /hal"yeuh seez'/ . Anat., Zool.
1. the first or innermost digit of the foot of humans and other primates or of the hind foot of other mammals; great toe; big toe.
2. the comparable, usually backward-directed digit in birds.
[ 1825-35; h ) allux, for L hallus, by assoc. with pollex thumb ]