The Collaborative International Dictionary of English v.0.48:

Adactyl \A*dac"tyl\, Adactylous \A*dac"tyl*ous\, a. [Gr. 'a
   priv. + ? finger.] (Zool.)
   (a) Without fingers or without toes.
   (b) Without claws on the feet (of crustaceous animals).
       [1913 Webster]