Source : WordNet®

sphenoidal fontanel
     n : the irregularly shaped area on either side of the cranium
         where the frontal bone and the anterior tip of the
         parietal bone and the temporal bone and the greater wing
         of the sphenoid bone meet; corresponds to the pterion
         when bones have ossified [syn: {sphenoid fontanelle}, {sphenoid
         fontanel}, {sphenoidal fontanelle}]