pter·o·saur 
(tĕrə-sôr′)
(tĕrə-sôr′)n.
Any of various extinct flying reptiles of the group Pterosauria, including the pterodactyls, of the Mesozoic Era, characterized by wings consisting of a membrane of skin extending from the side of the body to the very long fourth digit of the forelimb.
[From New Latin Pterosauria, order name : Greek pteron, feather, wing; see -PTER + Greek sauros, lizard.]