DICT.TW Dictionary Taiwan

 Sphe·neth·moid a.  Anat. Of or pertaining to both the sphenoidal and the ethmoidal regions of the skull, or the sphenethmoid bone; sphenethmoidal.
 Sphenethmoid bone Anat., a bone of the skull which surrounds the anterior end of the brain in many amphibia; the girdle bone.