Which prefix would indicate a medical term that involves something "under" another?

The prefix that indicates something "under" another is "sub-." This prefix comes from Latin, where "sub" translates to "under" or "below." It is commonly used in various medical terms to signify a position that is beneath or lower than another structure. For example, the term "subcutaneous" refers to the layer of tissue that lies beneath the skin.

The other prefixes have different meanings: "intra-" means "within," indicating something located inside, "peri-" signifies "around," suggesting something encircling an area, and "para-" refers to "beside" or "near." Understanding these distinctions helps in accurately interpreting medical terminology.