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pterosaur vs. pterodactyl

[ ter-uh-sawr ]
noun
  1. any flying reptile of the extinct order Pterosauria, from the Jurassic and Cretaceous periods, having the outside digit of the forelimb greatly elongated and supporting a wing membrane.
[ ter-uh-dak-til ]
noun
  1. any of a number of genera of flying reptiles of the extinct order Pterosauria, from the Jurassic and Cretaceous periods, having a highly reduced tail and teeth and a birdlike beak.