deinosaurian

from The Collaborative International Dictionary of English v.0.48

Dinosaur \Di"no*saur\, Dinosaurian \Di`no*sau"ri*an\, n. [Gr. ?
   terrible + ? lizard.] (Paleon.)
   One of the Dinosauria. [Written also {deinosaur}, and
   {deinosaurian}.]
   [1913 Webster]