PTEROSAUR

[ptero.saur] n [NL Pterosauria, fr. Gk pteron wing + sauros lizard] (1862): any of an order (Pterosauria) of extinct flying reptiles existing from the Late Triassic throughout the Jurassic and most of the Cretaceous and having a featherless wing membrane extending from the side of the body along the arm to the end of the greatly elongated fourth digit