Which of the following terms relates to a 'joint'?

The term that relates to a 'joint' is "articul/o." In medical terminology, the prefix "articul/o" specifically refers to joints or the act of joining. For example, "articulate" refers to the action of speaking clearly and distinctly, but in a medical context, it often pertains to the articulation of bones at a joint.

Understanding this terminology is important because it forms the basis for many medical terms associated with musculoskeletal health, such as "arthritis" (inflammation of the joint), or "articulation" (the connection between bones at a joint). This term helps healthcare professionals communicate effectively about conditions and procedures involving joints.

The other terms have completely different meanings: "arteri/o" pertains to arteries, "aque/o" relates to water, and "audi/o" is associated with hearing.