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.
Sphe*neth"moid, n. (Anat.)
The sphenethmoid bone.