Source : Webster's Revised Unabridged Dictionary (1913)

Postfrontal \Post*fron"tal\, a. [Pref. post- + frontal.] (Anat.)
   Situated behind the frontal bone or the frontal region of the
   skull; -- applied especially to a bone back of and below the
   frontal in many animals. -- n. A postfrontal bone.