Sphenethmoid

Part of speech: noun (n.)

The sphenethmoid bone.

Part of speech: adjective (a.)

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.