A synthetic organ was an organ of unnatural origin. While talking about the mechanical components of the Borg drones in armory in 2153, Doctor Phlox asked Lieutenant Reed, "If your heart was damaged, would you want me to replace it with a synthetic organ, or would you rather die?" (ENT: "Regeneration") In 2266, while creating an android duplicate of James T. Kirk using his android duplicator, Roger Korby commented that the synthetic organs were in place. (TOS: "What Are Little Girls Made Of?" )