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.

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.