Which combining form is used for the term related to the front of the body?

The combining form "ventr/i" is used in medical terminology to refer to the front of the body or the belly area. The term "ventral" derives from this combining form and describes the front aspect of the body. In anatomical positioning, the ventral side is opposite to the dorsal side, which refers to the back.

In contrast, "dors/o" is the combining form that pertains to the back or posterior side of the body. "Hist/o" relates to tissue, while "tox" concerns toxins or poisonous substances. Therefore, "ventr/i" is the most appropriate term for indicating the front of the body in medical contexts.