hallux

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hallux
1. The ‘great toe’. On the pentadactyl hind limb, the digit on the tibial side, which is often shorter than the other digits.

2. The first digit of the foot of a bird, forming the hind toe in many species. In some (e.g. Coliidae) it is reversible, in others (e.g. Apodidae) it points forward, but in some species it is reduced or absent.

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