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From: Webster's Revised Unabridged Dictionary (1913)

 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.