Ornithosauria

from The Collaborative International Dictionary of English v.0.48

Ornithosauria \Or*ni`tho*sau"ri*a\, prop. n. pl. [NL. See
   {Ornitho-}, and {Sauria}.] (Paleon.)
   An order of extinct flying reptiles; -- called also
   {{Pterosauria}}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Pterosauria \Pter`o*sau"ri*a\, n. pl. [NL.] (Paleon.)
   An extinct order of flying reptiles of the Mesozoic age; the
   pterodactyls; -- called also {{Pterodactyli}}, and
   {{Ornithosauria}}.
   [1913 Webster]

   Note: The wings were formed, like those of bats, by a
         leathery expansion of the skin, principally supported
         by the greatly enlarged outer or " little" fingers of
         the hands. The American Cretaceous pterodactyls had no
         teeth. See {Pteranodontia}, and {Pterodactyl}.
         [1913 Webster]