Source : Webster's Revised Unabridged Dictionary (1913)

Quadratojugal \Quad*ra`to*ju"gal\, a. (Anat.)
   (a) Of or pertaining to the quadrate and jugal bones.
   (b) Of or pertaining to the quadratojugal bone. -- n. The
       quadratojugal bone.

   {Quadratojugal bone} (Anat.), a bone at the base of the lower
      jaw in many animals.