The term 'not dorsal' can be summarized as the opposite of dorsal, which is VENTRAL. VENTRAL is a seven-letter word that refers to the lower or front surface of an animal's body. It is the opposite of dorsal, which is the upper or back surface. In anatomy, the terms VENTRAL and dorsal are used to describe the orientation of organs and other structures in relation to the body. For example, the heart is located ventrally in the chest cavity, while the spine is located dorsally.