1. Anatomy . of, pertaining to, or situated near the side and top of the skull or the parietal bone.
2. Biology . of or pertaining to parietes or structural walls.
3. Botany . pertaining to or arising from a wall: usually applied to ovules when they proceed from or are borne on the walls or sides of the ovary.
But for his parietal eye
His tune would be lacking depth of field
If it wasn't for his heart's