What is referred to as a device that replaces a missing body part?

A prosthesis is specifically designed to replace a missing body part, often following amputation or congenital absence. It functions to restore the appearance and, in many cases, the functional capability of the limb or organ it replaces. For example, a prosthetic leg will not only mimic the shape and look of a natural leg but is also engineered to aid in mobility, providing support and balance for the user.

In contrast, orthotics are devices intended to support or correct the function of a limb or specific body part but do not replace a missing component. Artificial limbs are a subset of prosthetics specifically designed to replace limbs, but the term "prosthesis" encompasses a wider range of devices that can replace various body parts, not just limbs. Assistive devices are broader and include any aids that assist individuals in performing daily tasks but do not necessarily replace missing body parts.