Final answer:
The relationship between the humerus and radius is described by stating that the radius is distal to the humerus, which means it is located further away from the body's center in the standard anatomical position.
Step-by-step explanation:
The term used to describe the relationship between the humerus and radius bones is that the radius is distal to the humerus. This terminology is part of anatomical directional terms, which are used to describe the locations of structures in relation to other structures within the body. The humerus is a bone in the upper arm, while the radius is one of the two major bones in the forearm. When we say that the radius is distal to the humerus, we mean that the radius is located further away from the center of the body compared to the humerus when in the standard anatomical position.