Sphenethmoid \Sphe*neth"moid\, a. [Sphenoid + ethmoid.]
(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.
Source: Webster's Revised Unabridged Dictionary (1913)
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