Which prefix indicates "between"?

The prefix that indicates "between" is "inter-". This prefix is derived from Latin, where it means "among" or "between." In medical terminology, it is commonly used to describe structures or conditions that occur between two or more entities. For example, in the term "intercostal," which refers to the muscles located between the ribs, the "inter-" prefix highlights the relationship between different rib pairs.

The other prefixes do not convey the idea of being between. "Sub-" suggests a position that is below or beneath, "hypo-" indicates a deficiency or under normal levels, and "brady-" refers to slow. These meanings clarify why "inter-" is the correct prefix for indicating a relationship or position that is between two or more items or areas.