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a.1.(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.
n.1.(Anat.) The sphenethmoid bone.