The Collaborative International Dictionary of English v.0.48:

Saurognathous \Sau*rog"na*thous\, a. [Gr. ? a lizard + ? the
   jaw.] (Zool.)
   Having the bones of the palate arranged as in saurians, the
   vomer consisting of two lateral halves, as in the woodpeckers
   (Pici).
   [1913 Webster]