What is an artificial replacement for a missing body part known as?

An artificial replacement for a missing body part is known as a prosthesis. This term specifically refers to devices designed to replace a missing limb or body part and restore function or appearance. Prostheses can be used for various body parts, including legs, arms, hands, and even more complex structures like facial features. The creation of a prosthesis is often tailored to the individual's needs, incorporating advancements in materials and technology to enhance usability and comfort.

The other options provided do not accurately describe an artificial replacement for missing body parts. An implant generally refers to a device inserted into the body, often used for medical purposes such as dental work, joint replacements, or cosmetic enhancements, but is not necessarily a replacement for an external body part. A replica typically refers to a reproduction or copy and does not serve the purpose of restoring function. A supplement usually denotes something added to enhance or complete a whole, rather than serving as a replacement. Thus, the most accurate term for an artificial replacement for a missing body part is indeed a prosthesis.