The Collaborative International Dictionary of English v.0.48:

Pelicosauria \Pel`i*co*sau"ri*a\, n. pl. [NL., fr. Gr. peli`ka a
   wooden bowl (but taken to mean, pelvis) + say^ros a lizard.]
   (Paleon.)
   A suborder of Theromorpha, including terrestrial reptiles
   from the Permian formation.
   [1913 Webster]