sphenethmoid

Sphe*neth"moid, a. Etym: [Sphenoid + ethmoid.] (Anat.) Defn: 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. Sphe*neth"moid, n. (Anat.) Defn: The sphenethmoid bone.

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