DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Pollex \Pol"lex\, n.; pl. Pollices. [the thumb.] (Anat.)
      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]