Final answer:
The term 'proximal' refers to a position in a limb that is nearer to the point of attachment or the trunk of the body, as in the brachium being proximal to the antebrachium.
Step-by-step explanation:
The medical term that means 'toward or nearest the trunk of the body' is proximal. This term is used to describe the position of a part of a limb relative to the point of attachment to the trunk. For example, the upper arm, or brachium, is proximal to the forearm, or antebrachium. Conversely, distal refers to a position farther from the point of attachment or trunk of the body. Other directional terms include superficial, which means nearer the surface, and deep, which indicates a position farther away from the body surface.