Which term in medical terminology indicates a position at the back of the body?

The term that indicates a position at the back of the body is "Dors." In medical terminology, "dorsal" refers specifically to the back side of an organism, which is derived from the Latin word "dorsum," meaning back. This term is commonly used in various medical and anatomical contexts to describe locations or aspects that are posterior or toward the spine.

On the other hand, the other choices represent different anatomical references. "Ventr" pertains to the front or belly side of the body, as seen in the term "ventral." "Infer" generally refers to a position lower in relation to another structure when used in terms like "inferior." "Later" refers to a position towards the side of the body, as in "lateral." Each of these terms describes different positional orientations and is essential for accurately conveying anatomical relationships within the body.