The term "cyborg" literally means "cybernetic organism" -- a being constructed of both mechanical and organic material. Although traditionally confined to the realms of science fiction, modern medicine and in particular prosthetics have made the term applicable to a number of human beings. Many people who could technically be labelled part-cybernetic, part-organic, have become so as the result of complex medical procedures, usually stemming from medical necessity. Some, however, chose to grant themselves cyborg status in the name of scientific advancement.
Via Dr. Stefan Gruenwald