Source : Webster's Revised Unabridged Dictionary (1913)

Pterodactyl \Pter`o*dac"tyl\, n. [Gr. ? a wing + ? finger, toe:
   cf. F. pt['e]rodactyle.] (Paleon.)
   An extinct flying reptile; one of the Pterosauria. See
   Illustration in Appendix.

Source : WordNet®

pterodactyl
     n : extinct flying reptile