prosthesis

This term is primarily used in medical and clinical contexts to describe an artificial replacement for a body part. While it is often used interchangeably with "artificial limb" in casual conversation, "prosthesis" is the precise technical term encompassing everything from dental implants and heart valves to complex robotic limbs.

Because the word is derived from Greek, it follows an irregular pluralization pattern. The singular ending "-is" changes to "-es" in the plural form, a characteristic shared with other Greek-rooted medical terms like "analysis" or "diagnosis."