What position refers to lying face down?

The term that describes lying face down is "prone." In medical terminology, the prone position is used in a variety of contexts, including during certain medical examinations, treatments, and surgeries. This position can facilitate access to the back and helps with procedures that require an unobstructed view or access to the posterior side of the body.

In contrast, the supine position refers to lying on one's back, which is the opposite of prone. The terms "distal" and "proximal" relate to the relative distance of body parts from the center or point of attachment. Distal means further from the center of the body or point of attachment, while proximal means closer to the center. These terms do not describe body positions but rather anatomical locations and relationships. Thus, "prone" is the correct term for lying face down.