Which anatomical term indicates that the palms of the hands are facing forward?

The term that indicates the palms of the hands are facing forward is "supinated." In anatomical terminology, "supination" refers specifically to the position where the forearm and hand are turned in such a way that the palms face upward or forward. This position is often used as a standard reference in anatomy and physiology when describing the positioning of the body in the anatomical position, where the body stands upright, with feet flat on the ground and arms at the sides, palms facing forward.

In contrast, "pronated" describes the opposite position where the palms would face downward or backward. "Flexed" refers to a bending movement that decreases the angle between two parts, for instance, bending an elbow or a knee, but does not specifically indicate the position of the palms. "Extended" denotes the straightening movement that increases the angle between body parts, such as straightening a bent arm, and also does not relate to the orientation of the palms. Thus, "supinated" is the correct term to use for the situation where the palms are faced forward.