Final answer:
The term 'anteroposterior' combines 'anterior' (front) and 'posterior' (back) and is used in medical terminology; however, adding the suffix -ior to create 'anteroposteriorior' would not be correct and is not recognized in medicine.
Step-by-step explanation:
To use the suffix -ior to build the medical term that means "pertaining to the front and to the back," we combine anterior and posterior, which are directional terms used in anatomy. The term anterior describes something pertaining to the front of the body, and posterior refers to something that is toward the back.
The prefix "antero-" derived from "anterior" is combined with the suffix "-posterior" to form "anteroposterior", however, since the question specifies the suffix -ior, we can adapt this to create the term anteroposteriorior, although this is not a standard medical term. It should be noted that in medical terminology, the standard term anteroposterior (without the suffix -ior) is commonly used to describe something relating to both the front and the back. Using the suffix -ior would not be correct and is not a recognized form in medical terminology.