The Collaborative International Dictionary of English v.0.48:

Birostrate \Bi*ros`trate\, Birostrated \Bi*ros"tra*ted\, a.
   [Pref. bi- + rostrate.]
   Having a double beak, or two processes resembling beaks.
   [1913 Webster]

         The capsule is bilocular and birostrated. --Ed. Encyc.
   [1913 Webster]