paleosaurus

from The Collaborative International Dictionary of English v.0.48

Paleosaurus \Pa`le*o*sau"rus\ (p[=a]`l[-e]*[-o]*s[add]"r[u^]s),
   n. [NL., fr. Gr. palaio`s ancient + say^ros a lizard.]
   (Paleon.)
   A genus of fossil saurians found in the Permian formation.
   [1913 Webster]