hallux

(hăl'əks)
n., pl., hal·lu·ces (hăl'yə-sēz', hăl'ə-).

1. The innermost or first digit on the hind foot of certain mammals. The human hallux is commonly called the big toe.
2. A homologous digit of a bird, reptile, or amphibian. In birds, it is often directed backward.

[Medieval Latin hallux, blend of Latin allus, hallus, thumb, and Latin hallex, big toe.]

(HAL-uhks)

noun, plural halluces (HAL-yuh-seez)
Big toe. More generally, the innermost digit on the hind foot of animals. It is usually backward-directed in birds.

Etymology
From Late Latin hallux, from Latin hallus, similar to pollex, thumb.

Usage
"Where in the human body would you find the hallux?" — Roger Perkins, The Quiz, The Daily Telegraph (UK), Dec 27, 1997.

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In anatomy, pertaining to the great toe.

the big toe