Source : Webster's Revised Unabridged Dictionary (1913)

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