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Pollex (noun)
The thumb; the first, or preaxial, digit of the forelimb, corresponding to the hallux in the hind limb. In birds, the pollex is the joint which bears the alula or bastard wing.
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Hallux (noun)
The big toe.
Wiktionary
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Pollex (noun)
the innermost digit of a forelimb, especially the thumb in primates.
Oxford Dictionary