Definition of: pterosaurian

(ter′ə·sôr′ē·ən) noun Paleontol.
One of an extinct order (Pterosauria) of flying reptiles, including pterodactyls, of the Mesozoic, with external digits long and developed to support a flying membrane. Also pter′o·saur.
—adjective Of or pertaining to the Pterosauria. [<NL <Gk. pteron a wing + sauros a lizard]