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Pollex
CIDE DICTIONARY
Pollex, n. [the thumb.].
The first, or preaxial, digit of the fore limb, corresponding to the hallux in the hind limb; the thumb. In birds, the pollex is the joint which bears the bastard wing. [1913 Webster]
OXFORD DICTIONARY
Pollex, n. (pl. pollices) the innermost digit of a forelimb, usu. the thumb in primates.
Etymology
L, = thumb or big toe
For further exploring for "Pollex" in Webster Dictionary Online